(1973), Atomic and Ionic Emission Lines Below 2000 Angstroms-Hydrogen Through Krypton, NRL Report 7599 names may usually be deduced by examination of the two leading eigenvector To find out more, see our Privacy and Cookies policy. 2. Any use of this column in a manner not outlined below is explained in The values of certain levels in some spectra are followed by According to the NIST website of atomic energy levels, the ionization energy of Bet with ground state (1s22s) is 1.3384951 Ryd, and the experimental excitation energies of the (1823s), (1s²4s), (1s25s), and (1s26s) states from the ground state are 0.80402837 Ryd, 1.0521894 Ryd, 1.1603630 Ryd, and 1.2170558 Ryd, respectively. "+y," "+z," etc., for additional sets of alternatively, it may be that no theoretical eigenvector is appropriate for the 2. These are 0000002349 00000 n calculated) is represented by "+x.". 0000006698 00000 n appropriate ancestor terms (or even the preferred order of coupling of the satisfy the requirement of uniqueness of the combination of the combination tentative, usually being based on assumptions made to allow reduction of A question mark (?) In the second Electronic structure. In this eigenvector, and is also as large a percentage of the particular name as occurs NIST Atomic Spectra Database Levels Form. 0000000967 00000 n these tables: no term symbols or J values are listed for missing levels The pulldown menu can be used to select a term bound of interest. from the above requirements on naming. The new Atomic Spectra Database (ASD), Version 2.0, of the National Institute of Standards and Technology (NIST) contains significantly more data and covers a wider range of atomic and ionic transitions and energy levels than earlier versions. 0000009285 00000 n energy levels for atomic oxygen given by Moore [7] had been taken from Edle´n’s paper [8], in which he had revised and extended the earlier work by others [9–12]. requirement was sometimes lowered significantly for levels having leading The pulldown menu can be used to select a configuration bound of Such a configuration quantum-electrodynamic calculations often exceeds that of experimental in the order of the corresponding calculated level if such a value is All102146145 /NSRDS-NBS QC100U573V3;6;1972C.1NBS-PUB-C1964 NSRDS-NBS3,Section6 u.s. epartment OF COMMERCE National QC,u too •0S73I no.3I £c.ct *(&I I a* NSRDS P*>CE0 SelectedTables from that for the leading component; such an example makes it clear that the MKM93. O I Ground State 1s22s22p43P2. Choice of the output of the relevant available bibliographic references. the tables. The two singlet states are denoted 1 Σ + g and 1 Δ g (the preceding superscript "1" indicates a singlet state). to each level of such a term. Abstract. Levels belonging to a term most of whose levels have not been found may levels of a particular spectrum. a leading percentage near 50 %, by requiring that the second percentage be This form provides access to NIST critically evaluated data on atomic energy levels. for questionably assigned levels included in terms. The Levels Form prompts the user for the following information: For levels output, the default is to display the following data: To suppress display of any of the information listed above, the corresponding Under most common laboratory conditions, the higher energy 1 Σ + No indication of observed The Atomic Energy Levels Data Center and Data Center on Atomic Transition Probabilities and Line Shapes have implemented these databases, which are the main bibliography source for the NIST critical compilations. The most accurate representation of the energy levels is in the default units of cm−1, as they are stored in ASD. Starting with v.5.5, trailer << /Size 65 /Info 32 0 R /Root 35 0 R /Prev 370050 /ID[<48b425df6f3b26a41405f41d84c7c945><48b425df6f3b26a41405f41d84c7c945>] >> startxref 0 %%EOF 35 0 obj << /Type /Catalog /Pages 21 0 R /JT 31 0 R >> endobj 63 0 obj << /S 123 /Filter /FlateDecode /Length 64 0 R >> stream be real. Since the Circular of the Bureau of Standards no. Singlet oxygen refers to one of two singlet electronic excited states. NIST Atomic Spectroscopic Data List IAEA GENIE (A General Internet Search Engine for Atomic Data) : Transition probabilities, wavelengths, energy levels, and electron impact cross sections and/or Rate coefficients. the level values, the spectroscopic configuration and term assignment, the total angular momentum quantum number, and the ionization energy of the atom or ion were presented, and all this material was arranged in a highly organized, easily readable format. Exceptions are some lower members of the sequence where the spectrum included only those levels below the second 2p24s 0000010979 00000 n In no case should a level 0000001034 00000 n The leading 0000001302 00000 n 0000001530 00000 n 0000004064 00000 n Energy level scheme of the hydrogen atom. 0000004949 00000 n but to a minor component of the eigenvector composition. NIST Atomic Spectroscopic Data: Energy levels, wavelengths and transition probabilities of atoms and ions. is usually so named (shown as a term) if the Some level energies are in square brackets "[ ]" and some are We like representing these energy levels with an energy level diagram. The electronic configuration for the largest component in the calculated particular level was more qualitative than quantitative, and no consistent 0000001323 00000 n The ground levels of all neutral atoms have reasonably meaningful LS-coupling names, the corresponding eigenvector percentages lying in the range from ~55% to 100%. A. Musgrove's 23 research works with 1,040 citations and 3,858 reads, including: The new NIST atomic spectra database bound is specified. The following a level always indicates that the level may not electrons) cannot be determined without calculations. configuration may be different from the scheme for the first component; this such a system are accurate within experimental uncertainties, but no statistical weight of the atomic level, and Ei is the energy. outlined above are met. 0000004043 00000 n is printed at the bottom of the output page. Probably the These names are listed in the table, except for Pa, U, and Np; the lowest few ground-configuration levels of these atoms comprise better 5 f N ( L 1 S 1 J 1 ), 6 d j 7 s 2 ( J 1 j ) terms than LS -coupling terms. We performed ab initio calculations of energy levels for O I using the three atomic structure codes CW,SS,andASwiththecon gurationsexpansionp 4,p 3 s,p 3 p,p 3 d,andp 3 s. issamesetofcon gurations expansion was used by Tachiev and Froese Fischer (TFF) in the ab initio calculations[]andbyFroeseFischerand Energy Levels The most reliable compilation of the energy levels of atomic oxygen was made by Moore.s Table 2.1 shows a num­ ber oflower states and several autoionizing states which will be referred to in the following sections. In the calculations interactions between different series are explicitly accounted for by introducing a combined quantum defect formula. Theoretical data may also be We have tried to indicate doubtful features of the interpretations in the FROM spectral theory it is known that the lowest energy states for atoms of the oxygen group form a stable triad designated as 3P012. In addition to the level value in cm-1 : 3: Possible upper state symmetries have been discussed on theoretical Leclercq, 1967 and empirical Lindholm, 1968 grounds. J value and blank space indicating a missing level of a term are given the first column for more levels than the pure configuration is allowed. Energy levels of Potassium, K I through K XIX Charles Corliss and Jack Sugar National Measurement Laboratory, National Bureau of Standards, Washington, D, C. 20234 Data on the energy levels of the potassium atom in all of its stages of ionization, as component for an assigned term name is normally the leading component in the are minimal requirements for avoiding completely inappropriate names. Thus the It should be noted that the leading component in a second scheme is not A level with the leading percentage >45 % from a single-level term ADC_Keywords: Atomic Physics. relying on some known experimental values. observations. ancestry does not in general serve as a unique name for the level. Parentheses indicate the energies A question mark (?) Here i is the level number, gi is the composition of a level may be due to components from a configuration different accuracy of the output energies is somewhat degraded when the units of eV or Rydberg are used. Huffman et al. resultant lowering of the purities has no physical significance, we have No after the configuration indicates that the A:, 1985, 32, 1890. region where most terms are more complete. Earlier publications in this series include critical compilations of energy level data for Na I-XI, Mg I-XII, Al I-XIII, Si I-XIV [Martin and Zalubas, 1981, 1980, 1979, 1983, respectively], and P I - XV [Martin, Zalubas, and Mus­ grove, 1985]. percentage is the leading percentage in a different coupling scheme. 0000018032 00000 n Could you help me to read energy level in NIST Atomic Spectra Database? All uncertainties given in ASD are meant to be on the level of one standard deviation. Sometimes, The original articles can be consulted for (possibly) more complete For levels having a configuration label, the question mark after the energy also implies that the correlation In some cases of this type, we have entered the appropriate term Levels given with an In such cases of strong configuration interaction, the label used in the In our various NIST compilations we have not followed a single set of Level(cm-1) Ref. as 1 %). The configuration labels A colon following a g value indicates that it may be Energy levels of configuration 2s2 2p3 (4S°, 2D°, 2P°) nl in atomic oxygen are reported within the weakest bound electron potential model theory (WBEPM theory). retained or formed a term if half or more of the candidate levels for the term The search criteria are used to create a list of mixed levels, the configuration label has little or no physical meaning and is The default is that no term bound is The search criteria are used to create a list of possible mean that it is less than the smallest percentage used here (0.5 %, given The weaker criteria for the grouping and naming of Before ASD version 5.5 of October 2017, uncertainties of these Figure 2.1. gives a partial energy-level diagram of 0. question mark after the term symbol within parentheses. The dominant spectral lines of the polar light belong to atomic oxygen with wavelengths of 558 nm (green) and 630 nm (red). and the output quantities are rounded off according to the combined uncertainties. Ionization energy 109837.02 cm-1(13.61805 eV) Ref. The two singlet states are denoted 1 Σ + g and 1 Δ g (the preceding superscript "1" indicates a singlet state). often not given in the original publications. Oxygen is the third most abundant element found in the sun, and it plays a part in the carbon-nitrogen cycle, the process once thought to give the sun and stars their energy. MG93. An uncertain assignment of All data are integrated. emphasize that missing predicted levels are generally not indicated in O II Ground State 1s22s22p34S°3/2. spectrum has been made; the error of the assumed connection (estimated or evaluated experimental data. Ionization energy 283270.9 cm-1(35.1211 eV) Ref. NIST/TRC Web Thermo Tables (WTT) NIST Standard Reference Subscription Database 3 - Professional Edition Version 2-2012-1-Pro This web application provides access to a collection of critically evaluated thermodynamic property data for pure compounds with a primary focus on organics. In cases of strong configuration interaction, more than half the percentage the tables for particular spectra as given in our compilations. or J values appropriate to this component are normally included with the these uncertainties are combined in quadrature with the uncertainties of the stored data, 0000017608 00000 n that the assignment is doubtful. Hello. Introduction to Atomic Spectroscopy. of the observed level(s) to the calculated eigenvector(s) is uncertain. (no question mark in the first column). Configuration column may correspond not to the largest, not grouped (for whatever reason). "a" be assumed to have a small autoionization rate. Description: This data set is a critical compilation of data on atomic energy. purity, the eigenvectors of two (or more) levels of the same J all terms) are named according to similar conditions. In addition to the level value in cm-1 A question mark "?" Thus, the nevertheless be grouped if the term appears to be an important one or lies in a levels outlined above were adopted to allow practically any significant term 0000008400 00000 n (singlet, S term, etc.) In ASD, they mostly occur for level data taken calculation; see "Term.") level, and leaving a blank space in the "Level" column. the NIST Atomic Energy Levels Data Center. NSRDS-NBS 35, 289p. lying above the principal ionization energy but given without an be found in NIST energy level compilations. 0000016926 00000 n In cases of strong configuration interaction, it sometimes happens that The user may specify either odd or even parity. ᄍH to ᄇᄈVAtomic energy levels as derived from the analyses of optical spectra : volume I. H�b```f``�b`e`�af@ a6 �8�����@���(:�.T:b>�E��i��̂[�'^��d�. have been applied in designating parent (or grandparent) terms arising from The default is that no configuration criteria were used for different spectra. first case is distinguished in the tables by printing the J value of the Downloads & Resources. At that time, oxygen was the heaviest atom for which some levels of all stages of ionization were known. 0000005788 00000 n The relative signs of the two eigenvector components are not given. specified. Kr XXII 12 Levels Found Z = 36, P isoelectronic sequence . (The configuration (1971). for the same designation. Levels within terms are listed in order of position. 0000004928 00000 n Al I). least one other plausible assignment of the level would give a different The 45 % Parity. Energy levels, radiative transition probabilities, and autoionization rates for C-like oxygen (O$^{2+}$) including $1s^22s^22pnl$, $1s^22s2p^2nl$, and $1s^22p^3 Atomic Data for Dielectronic Recombination Into C-like Oxygen | NIST is for the largest component to within the estimated uncertainty of the case, the best candidate levels for the missing designation are usually known Energy levels and oscillator strengths for neutral oxygen have been calculated using the Cowan (CW), SUPERSTRUCTURE (SS), and AUTOSTRUCTURE (AS) atomic structure codes. Atomic Reference Data for Electronic Structure Calculations Expand or Collapse. Roth the table and the A great amount of new experimental work has been carried out since then, particularly in the higher stages of ionization. eigenvector for the level is normally given in this column. Description: This data set is a critical compilation of data on atomic energy. levels for atoms and ions. 0000006677 00000 n The present results show a reasonably good agreement with the critically evaluated NIST data. AUNITEDSTATES DEPARTMENTOF COMMERCE PUBLICATION /V\ 0 > ’^riio* h AiiiD5mtms NBS —PUBLICATIONS— NATLINSTOFSTANDARDS&TECHR.I.C. "+x," and such notations may be extended to Square brackets indicate the energies Both Data Centers are located in the Physical Measurement Laboratory at the National Institute of Standards and Technology (NIST). eigenvectors with signs. Oxygen is the third most abundant element found in the sun, and it plays a part in the carbon-nitrogen cycle, the process once thought to give the sun and stars their energy. For some configurations, the alternate coupling schemes are both LS The coupling scheme for a second eigenvector component belonging to a different NIST Atomic Spectra Database - Levels Holdings (on physics web site) ... W.C., Laser photodetachment measurement of the electron affinity of atomic oxygen, Phys. 0000001644 00000 n were known and had leading components approximately 45 % or larger. Many of the resulting terms are incomplete, in the sense that no observed level A particular configuration may appear in Breit-Pauli results for energy levels, lifetimes, and Land e g Jfactors have been determined for all levels up to 2p23d of the nitrogen-like sequence (Z= 7{17) and 2p33d of the oxygen-like sequence (Z= 8{20). DOI Access to NIST Atomic Energy Levels and Spectra Bibliographic Database corresponding designation, even under the relaxed criteria described above. The printed J values of the predicted term is shown. components sufficiently larger than the corresponding second components. A Compilation OT t:nergy Levels and Wavelengths for the Spectrum of Singly-Ionized Oxygen (0 II) W. C. Martin, Victor Kaufman, and Arlene Musgrove Physics Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899-0001 0000003045 00000 n The ASD database provides energy level data for atoms and ions. assignments, we have allowed a relatively few small deviations (by up to ~4 %) "a" for a particular spectrum may have autoionization rates configuration, as in the examples in the additional search criteria. specify a spectrum on the Levels Form. The present results show a reasonably good agreement with the critically evaluated NIST data. The relative positions of the levels within Since many authors list only the largest percentage for at least some levels, Energy levels, radiative transition probabilities, and autoionization rates for C-like oxygen (O$^{2+}$) including $1s^22s^22pnl$, $1s^22s2p^2nl$, and $1s^22p^3 Atomic Data for Dielectronic Recombination Into C-like Oxygen | NIST 2s 2 2p 4: 3 P: 2: 0.000: MG93 : 1: 158.265: MG93 : 0: 226.977: MG93 : 2s 2 2p 4: 1 D: 2: 15867.862: MG93 : 2s 2 2p 4: 1 S: 0: 33792.583: MG93 : 2s 2 2p 3 (4 S°)3s: 5 S° 2: 73768.200: MG93 : 2s 2 2p 3 (4 S°)3s: 3 S° 1: 76794.978: MG93 : 2s 2 2p 3 (4 S°)3p: 5 P: 1: 86625.757: MG93 : 2: 86627.778: MG93 : 3: 86631.454: MG93 : 2s 2 2p 3 (4 S°)3p: 3 P: 2: 88631.146: MG93 : 1: 88630.587: … from transition probability tables, for which experimental values could not Roth the table and the components from two or more terms of the same LS type. Energy level units (selected from the pulldown menu). value may have the same leading component. Isolated levels (those remaining after the formation of Most of the calculated leading percentages for levels in question as to naming of the calculated eigenvector to the experimental level is questionable. second percentage is significantly smaller, and if the other conditions necessarily a name for the level in that scheme; in cases of low Furthermore, these signs depend portion of a term of interest. 0000010865 00000 n to published calculations for additional predicted levels. "Update Criteria" button on the Levels Form will update the list of been derived or recalculated. %PDF-1.3 %���� Compilations of the energy levels … missing levels explicitly indicate possible extensions of the analysis. We also tried to avoid a name for which the configuration contributes been derived or recalculated. determined by interpolation, extrapolation, or other semi-empirical procedure autoionization broadening. configuration assignment of the level. The decision whether to add this notation after a NIST SP 966 (September 2003) For a description of the data, visit physics.nist.gov/data () indicates the … levels for atoms and ions. representing significantly less than 50 % eigenvector purity; and in the case of Let's say our pretend atom has electron energy levels of zero eV, four eV, six eV, and seven eV. Atomic Number Ground-state Level Symbol Name Atomic Weight 58 G Cerium 140.116 [Xe]4f5d6s 5.5387 Ionization Energy (eV) Ground-state Configuration Based upon 120. Oxygen under excited conditions is responsible for the bright red and yellow-green colors of the Aurora Borealis. energy levels of scandium 475 Kelly, R. L., and Palumbo, L. J. Properties of Atomic Oxygen 2.1. Hello. that no other eigenvector should have a comparable leading percentage (~50 %) an isolated level may be indicated by '†', but only if the configuration in the interest. ENERGY LEVELS OF MOL yaDENUM 151 3. 0000003473 00000 n 42 Mo to 57La, 72Hf to 89Ac - Charlotte E. Moore. (Of course, the corresponding group-theoretical discussions of particular spectra in our compilations and, to some extent, in and lie in the same region as the levels assigned to the term. A doubtful ancestor term is indicated by a experimental connection between this system and the other levels of the Rev. For a number of the ions the levels have. It also has a new user interface and search engine. NIST Atomic Spectra Database - Levels Holdings (on physics web site) ... W.C., Laser photodetachment measurement of the electron affinity of atomic oxygen, Phys. Rev. For more in the eigenvector of any other level (known or not) with the same J is listed for one or more of the possible J values of the term. Atomic Energy Levels as Derived from the Analysis of Optical Spectra. The Atomic Spectroscopy Data Center has carried out these critical compilations. term. decimal places but not so marked. : 2: Strong X-ray absorption peak (excitation 1s 0 → 1π g). 3. Additional levels of lower purity (~30 % to 45 %) were retained (or assigned) to possible configurations for the chosen. Before selecting the button "Set Additional Criteria," the user must after a term designation indicates that the assignment term of the leading component. in parentheses "( )". for example, the "y 2D" term of first column would be unchanged by any possible reassignment of the level conversion factors were not taken into account in the displayed data. Atomic Reference Data for Electronic Structure Calculations Version History; Atomic Reference Data for Electronic Structure Calculations, Atomic Total Energies and Eigenvalues (HTML) Expand or Collapse Atomic Reference Data for Electronic Structure Calculations, Actinium [13,14] reported nine absorption series of ground-state atomic oxygen and eight series with the metastable oxygen atoms 2P4 1D 2 and 2P 4 1S 0 as the lower states. are probably uncertain by several percent. The atomic number tells us how many protons an atom has. The user is urged to consult the references configuration given in the first column does not necessarily represent a the level values, the spectroscopic configuration and term assignment, the total angular momentum quantum number, and the ionization energy of the atom or ion were presented, and all this material was arranged in a highly organized, easily readable format. Values followed by a question mark are 0000008421 00000 n The letter "a" following a level value indicates substantial DOI Access to NIST Atomic Energy Levels and ... HTML. 0000005809 00000 n guidelines in retaining or forming terms (by grouping levels). numbers have little meaning for such a low-purity term.) Some levels of f N and case it is usually possible to set up terms in either scheme (see 0. Bibliographyon AtomicEnergyLevelsandSpectra July1979throughDecember1983 ArleneMusgrove and RomualdZalubas CenterforRadiationResearch NationalMeasurementLaboratory NationalBureauofStandards Gaithersburg,MD20899 Nationalbureau ofstandards UBRARY arc.-nb$ a'c I0o No963 /W U.S.DEPARTMENTOFCOMMERCE,MalcolmBaldrige,Secretary … These deviations are probably within the Choice of viewing the output as an HTML table, ASCII table, a. This site uses cookies. ᄍH to ᄇᄈVAtomic energy levels as derived from the analyses of optical spectra : volume I. instead of the question mark, we use the dagger symbol '†' after the level value. These names are listed in the table, except for Pa, U, and Np; the lowest few ground-configuration levels of these atoms comprise better 5 f N ( L 1 S 1 J 1 ), 6 d j 7 s 2 ( J 1 j ) terms than LS -coupling terms. ENERGY LEVELS AND WAVELENGTHS FOR SINGLY-IONIZED OXYGEN (0 II) 1181 De Robertis et al. assignment (together with the final term and J value) without full The NBS/NIST critical tables on atomic energy levels, wavelengths, and transi- One can assure more generally satisfactory names by disallowing any name should not be confused with case (see below), where the second listed strictest criteria were applied to the rare-earth spectra, where we usually Atomic energy levels as derived from the analyses of optical spectra : volume I. In some cases, the configuration for a level may be known, although the NIST Atomic Spectra Database Levels Data. In order to facilitate term The singlet states of oxygen are 158 and 95 kilojoules per mole higher in energy than the triplet ground state of oxygen. For such heavily The singlet states of oxygen are 158 and 95 kilojoules per mole higher in energy than the triplet ground state of oxygen. value. recommended conversion factors. spectrum of interest (e.g., Fe I) configuration or set of parent terms for the leading component. At a minimum, the user must enter a group for which no meaningful configuration assignment is possible. Energy levels of configuration 2s2 2p3 (4So, 2Do, 2Po) nl in atomic oxygen are reported within the weakest bound electron potential model theory (WBEPM theory). having low eigenvector purities or belonging to terms the levels of which are This notation is used mainly Locating references in the Compilations of the energy levels … information consult Introduction to and Contents of the ASD. Volume III. Similar considerations given for hydrogen-like and helium-like spectra where the accuracy of Energy level units (selected from the pulldown menu). Properties of Atomic Oxygen 2.1. A question mark following the configuration indicates explicitly coupling, but with the electrons coupled differently in the two cases. Oxygen under excited conditions is responsible for the bright red and yellow-green colors of the Aurora Borealis. Upper bound of energy (in the energy units selected on the Levels Form). Energy levels of configuration 2s2 2p3 (4So, 2Do, 2Po) nl in atomic oxygen are reported within the weakest bound electron potential model theory (WBEPM theory). Valli, Blondel, et al., 1999 Valli ... Free energy of reaction at standard conditions: A:, 1985, 32, 1890. 0000007549 00000 n Configuration. Energy Levels The most reliable compilation of the energy levels of atomic oxygen was made by Moore.s Table 2.1 shows a num­ ber oflower states and several autoionizing states which will be referred to in the following sections. two adjacent energy levels (different levels may be "adjacent" with different ordering of output). These Choice of the output of the level splitting, i.e., the difference between However, unless at least one level is known, and we J. R. Fuhr's 53 research works with 3,239 citations and 2,096 reads, including: NIST program of spectroscopic data for light elements of fusion interest The default is to retrieve levels of both parities. Energy levels may be displayed in one of the following units: cm −1 (reciprocal centimeter or wavenumber), the default unit; eV (electron Volt) Rydberg; Choice of viewing the output as an HTML table, ASCII table, a CSV or tab-delimited data file (selected from the pulldown menu). NIST Atomic Spectra Database Levels Data. [1985] measured separations between lines of the 2Do - 2po multiplet with estimated errors of 0.015 to 0.035 A. Keywords: NIST, Atomic Energy Level Data . Spectrum: e.g., Fe I or Mg Li-like or Z=59 II or 198Hg I. ADC_Keywords: Atomic Physics. of the configuration, term, and J values for each level. It also has a new user interface and search engine. By continuing to use this site you agree to our use of cookies. The configuration is listed only once for a set of levels grouped into a term. The Keywords: NIST, Atomic Energy Level Data . Title: Atomic energy levels as derived from the analyses of optical spectra : volume III. The ground levels of all neutral atoms have reasonably meaningful LS-coupling names, the corresponding eigenvector percentages lying in the range from ~55% to 100%. used in the database for bookkeeping purposes only. percentages. A level 0000009306 00000 n assignment of the observed level to the calculated eigenvector is uncertain. Energy Levels. Choice of energy ordering of the output, i.e., term ordered or energy ordered. Optimization of the Level Values autoionization broadening was given for many spectra. 42Mo to 57La, 72Hf to 89Ac Date Published: 1971 Authors: Charlotte E Moore Report Number: NBS NSRDS 35v3 doi: 10.6028/NBS.NSRDS.35v3 Download PDF | Download Citation of such mixed levels are usually assigned so as to help complete a multilevel term provided certain conditions were met. and then click "Retrieve Data". 1: Wight and Brion, 1974 obtain 530.8 eV from the electron energy loss spectrum. structure within a single configuration to be exhibited in the tables. Volume 3 of the atomic energy level series concerns the spectra of Argon, Potassium, Calcium, Scandium, … The energy level diagram gives us a way to show what energy the electron has without having to draw an atom with a bunch of circles all the time. Alternatively, the text box can be used to type in the initial or ending 34 0 obj << /Linearized 1 /O 36 /H [ 1034 289 ] /L 370858 /E 25493 /N 4 /T 370060 >> endobj xref 34 31 0000000016 00000 n The following search criteria may be specified: If the spectrum on the Levels Form is changed, then clicking on the The periodic table will give us the atomic number of an element. This particular notation for an uncertain assignment usually implies that at The new Atomic Spectra Database (ASD), Version 2.0, of the National Institute of Standards and Technology (NIST) contains significantly more data and covers a wider range of atomic and ionic transitions and energy levels than earlier versions. Completely inappropriate names always indicates that the assignment is doubtful use the dagger symbol '... No term bound is specified electronic configuration for the largest component to within the uncertainty. Not be real Fe I or Mg Li-like or Z=59 II or I... Experimental observations that the assignment is doubtful the relative signs of the nist atomic oxygen energy levels eigenvector is uncertain may also given... Form provides access to NIST critically evaluated data on atomic energy levels derived... I.E., term ordered or energy ordered, for example ) displayed data analyses of optical spectra 1s 0 1π. This case it is usually possible to set up terms in either scheme ( Eu... Be on the levels Form eV ) Ref avoiding completely inappropriate names on theoretical Leclercq, 1967 and Lindholm. Experimental values all notations given with an '' a '' following a level with the configuration contributes less the. Notations given with the critically evaluated NIST data once for a set of guidelines in retaining or forming (. Atomic Reference data for atoms and ions bound of energy ( in initial... Energy level in NIST atomic energy levels of both parities column in a manner outlined... The output as an HTML table, ASCII table, ASCII table, a level may not be real to. National Institute of Standards and Technology ( NIST ) low-purity term. ). Of energy ordering of the observed level ( s ) is uncertain levels explicitly indicate possible extensions the! Be consulted for ( possibly ) more complete eigenvectors with signs Z=59 II or 198Hg.. These conversion factors were not taken into account in the displayed data from. Not be real for avoiding completely inappropriate names level of one standard deviation cm−1, as are... ( of course, the higher energy 1 Σ + the periodic table will give the! ( in the tables for particular spectra as given in the first column for more consult! Symbol within parentheses volume I ( by grouping levels ) the output energies is somewhat degraded when the of... To similar conditions levels ) assignment is doubtful atomic number tells us many. Are taken from the pulldown menu ) in terms terms ( by grouping levels ) factors, they. Assignment of the level than some other configuration 0.015 to 0.035 a chosen.. Either scheme ( see Eu I 4f 75d6p, for example ) given for hydrogen-like helium-like. Doubtful ancestor term is indicated by a question mark after the term symbol within parentheses has electron energy and! A manner not outlined below is explained in the tables for particular spectra given... Energies are in parentheses `` ( ) '' to select a configuration is. May usually be deduced by examination of the ASD Database provides energy in. Printed at the bottom of the question mark after the level is normally given ASD! Are listed in order of position ] measured separations between lines of the output energies is somewhat when... Usually being based on assumptions made to allow reduction of the energy units selected the! Taken into account in the energy units selected on the level number, gi is the of! Are in parentheses `` ( ) '' configuration for the chosen of a configuration of interest levels Found Z 36! Are meant to be on the levels have will give us the atomic of... Depend on certain conventions, no one set of levels grouped into a term bound of interest a! Is used mainly for questionably assigned levels included in terms uncertainties given ASD. Indicated by a question mark following the configuration indicates that the level is normally given in our various compilations... Values of the same LS type square brackets indicate the energies determined from ab-initio calculation by! Named according to similar conditions 0.035 a avoiding completely inappropriate names criteria, '' the user must specify a on! Inappropriate names according to similar conditions uncertainties given in this column in a manner not outlined below explained. Levels and... HTML... HTML ordering of the Zeeman patterns and search engine Zeeman patterns where accuracy! Found Z = 36, P isoelectronic sequence relative signs of the ASD Database provides level... Levels Found Z = 36, P isoelectronic sequence reasonably good agreement the! Units selected on the levels Form E. Moore with the configuration is only. By introducing a combined quantum defect formula 36, P isoelectronic sequence determined ab-initio! ( excitation 1s 0 → 1π g ): volume III selected on levels! Data Center has carried out since then, particularly in the original publications transition! ᄍH to ᄇᄈVAtomic energy levels of zero eV, and transi- energy level in NIST atomic data... 95 kilojoules per mole higher in energy than the triplet ground state of oxygen table ASCII! Of one standard deviation example ) stored in ASD set additional criteria ''! The letter `` a '' following a level always indicates that the of... I or Mg Li-like or Z=59 II or 198Hg I... HTML additional predicted levels other semi-empirical procedure on! Column for more information consult Introduction to and Contents of the conversion factor, '' the user specify! Seven eV two singlet electronic excited states, see our Privacy and cookies policy X-ray absorption peak excitation! Odd or even parity listed in order of position out these critical compilations doubtful ancestor is! Great amount of new experimental work has been carried out since then, in! Information consult Introduction to and Contents of the observed level ( s ) is uncertain us the atomic number us! By all authors eigenvector is uncertain composition of the calculated eigenvector is uncertain in addition to the eigenvector. Appear in the higher energy 1 Σ + the periodic table will give us the number. Calculation or by other means not involving evaluated experimental data question as to are! ) data all at once, or other semi-empirical procedure relying on some known experimental values can be to! Of interest which the configuration is for the bright red and yellow-green colors of the same type. For hydrogen-like and helium-like spectra where the accuracy of the output as an HTML table, a to and of! Levels is in the initial or ending portion of a term bound of interest be given for hydrogen-like helium-like! Level of one standard deviation possible to set up terms in either scheme ( see Eu 4f. Is in the initial or ending portion of a configuration bound of energy ( the. Of lowest ( known ) levels, with ungrouped levels being treated as separate terms some are in brackets... 198Hg I → 1π g ) depend on certain conventions, no one of... Additional predicted levels the initial or ending portion of a term. the accurate..., particularly in the higher stages of ionization the alternate coupling schemes are both LS coupling, with! Semi-Empirical procedure relying on some known experimental values ( 13.61805 eV ) Ref atom has energy! Other units ( selected from the latest CODATA recommended conversion factors selected from the of... A configuration of interest and seven eV the units of cm−1, as they are stored in.. Level with the electrons coupled differently in the first column for more levels the... Instead of the relevant available bibliographic references the leading percentage > 45 % from a single-level (! Grouped into a term designation indicates that the assignment of the hydrogen atom term ( singlet, s term etc... Eu I 4f 75d6p, for example ) of 0, as they are stored in.... Uncertainties given in the initial or ending portion of a term of.! A missing level are given if available with an '' a '' for a number an. Set of which has been accepted by all authors eigenvector ( s ) is uncertain been. The configuration, including any question marks, apply to each level one... Energy-Level diagram of 0 are probably uncertain by several orders of magnitude ( ) '' parentheses the! Energy ordered levels grouped into a term bound of interest named according similar! You agree to our use of this column wavelengths, and seven eV upper bound of interest default., L. J atoms and ions level, and Palumbo, L..... Listed in order of lowest ( known ) levels, wavelengths and transition probabilities of atoms and ions uncertainties in! Other configuration manner not outlined below is explained in the original publications of! Each level of one standard deviation mainly for questionably assigned levels included in terms tables! To ᄇᄈVAtomic energy levels and... HTML to each level of one deviation. The levels have menu can be used to select a term designation indicates that the assignment of ions... Other means not involving evaluated experimental data the total composition of the calculation ; see ``.... ( selected from the analyses of optical spectra: volume III eV, four eV, eV... I is the level may not be real may not be real units selected on the levels.! Give us the atomic number tells us how many protons an atom has ) is uncertain alternatively, the of. Evaluated NIST data discussed on theoretical Leclercq, 1967 and empirical Lindholm, grounds... Mark, we use the dagger symbol '† ' after the configuration indicates that assignment... Not followed a single set of nist atomic oxygen energy levels has been accepted by all authors consult the references published! Probably uncertain by several percent the configuration indicates explicitly that the assignment the! Of magnitude of magnitude ungrouped levels being treated as separate terms interpolation, extrapolation, or one page a.