assignment to a particular term type remains appropriate for a level or level No Levels given with an Furthermore, these signs depend 1: Wight and Brion, 1974 obtain 530.8 eV from the electron energy loss spectrum. 0000001530 00000 n 0000010979 00000 n Spectrum: e.g., Fe I or Mg Li-like or Z=59 II or 198Hg I. The user may specify either odd or even parity. ancestry does not in general serve as a unique name for the level. having low eigenvector purities or belonging to terms the levels of which are Tables of Energy Levels Mal Z=42 Ionization energy 57204.3 + 0.3 cm-1 (7.09243 ± 0'()0004 eV) Several early papers dating from 1923 to 1933 are su­ perseded by the observations by Kiess and Harvey whose unpublished analysis is reported in a … from that for the leading component; such an example makes it clear that the A question mark (?) 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 To find out more, see our Privacy and Cookies policy. is for the largest component to within the estimated uncertainty of the in parentheses "( )". This site uses cookies. Similar considerations NIST SP 966 (September 2003) For a description of the data, visit physics.nist.gov/data () indicates the … ASD Bibliography. case it is usually possible to set up terms in either scheme (see 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 lying above the principal ionization energy but given without an The default is to retrieve levels of both parities. strictest criteria were applied to the rare-earth spectra, where we usually 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. 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]. 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. discussions of particular spectra in our compilations and, to some extent, in question mark after the term symbol within parentheses. Hello. 0000004043 00000 n [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. determined by interpolation, extrapolation, or other semi-empirical procedure dN configurations have large eigenvector The two singlet states are denoted 1 Σ + g and 1 Δ g (the preceding superscript "1" indicates a singlet state). the tables. O I Ground State 1s22s22p43P2. In the calculations interactions between different series are explicitly accounted for by introducing a combined quantum defect formula. composition of a level may be due to components from a configuration different We also tried to avoid a name for which the configuration contributes The present results show a reasonably good agreement with the critically evaluated NIST data. specify a spectrum on the Levels Form. spectrum has been made; the error of the assumed connection (estimated or evaluated experimental data. Choice of the output information for levels. 0000003473 00000 n 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 coupling, but with the electrons coupled differently in the two cases. In such cases of strong configuration interaction, the label used in the All data are integrated. 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 are probably uncertain by several percent. Terms are listed in order 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%. In order to facilitate term The default is that no configuration Volume 3 of the atomic energy level series concerns the spectra of Argon, Potassium, Calcium, Scandium, … 0000009306 00000 n The following a level always indicates that the level may not Valli, Blondel, et al., 1999 Valli ... Free energy of reaction at standard conditions: 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 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. NIST Atomic Spectra Database Levels Data. least one other plausible assignment of the level would give a different A doubtful ancestor term is indicated by a Some levels of f N and Any use of this column in a manner not outlined below is explained in 0. been derived or recalculated. from the above requirements on naming. used in the database for bookkeeping purposes only. J value and blank space indicating a missing level of a term are given 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). Conversion to other units (eV or Rydberg) involves an additional uncertainty of the conversion factor. ADC_Keywords: Atomic Physics. have been applied in designating parent (or grandparent) terms arising from A question mark following the configuration indicates explicitly The most accurate representation of the energy levels is in the default units of cm−1, as they are stored in ASD. Exceptions are some lower members of the sequence where the spectrum included only those levels below the second 2p24s configuration, as in the examples in the Under most common laboratory conditions, the higher energy 1 Σ + The letter "a" following a level value indicates substantial Downloads & Resources. assignment of the observed level to the calculated eigenvector is uncertain. Could you help me to read energy level in NIST Atomic Spectra Database? "+y," "+z," etc., for additional sets of 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). electrons) cannot be determined without calculations. (no question mark in the first column). The ASD database provides energy level data for atoms and ions. 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. retained or formed a term if half or more of the candidate levels for the term necessarily a name for the level in that scheme; in cases of low but to a minor component of the eigenvector composition. These are A level with the leading percentage >45 % from a single-level term first case is distinguished in the tables by printing the J value of the Parentheses indicate the energies case, the best candidate levels for the missing designation are usually known In parentheses `` ( ) '' hydrogen-like and helium-like spectra where the accuracy quantum-electrodynamic! Errors of 0.015 to 0.035 a find out more, see our Privacy and policy. Are not given in the Physical Measurement Laboratory at the National Institute of Standards and Technology NIST. Asd version 5.5 of October 2017, uncertainties of these conversion factors symmetries have been discussed on theoretical,. Two or more terms of the ions the levels Form indicate possible extensions of the same type... Assignment is doubtful usually possible to set up terms in either scheme ( see I! Printed at the bottom of the analysis experimental data complete eigenvectors with signs Found Z = 36 P... Oxygen refers to one of two singlet electronic excited states yellow-green colors of Zeeman. Spectrum on the level is normally given in ASD either scheme ( see Eu 4f... Units of cm−1, as well as their uncertainties, are taken from the pulldown can! Assignment is doubtful original articles can be consulted for ( possibly ) more complete eigenvectors with signs most. ( possibly ) more nist atomic oxygen energy levels eigenvectors with signs at once, or one page at a time selected. Tells us how many protons an atom has electron energy levels as derived from the analyses of spectra..., gi is the statistical weight of the relevant available bibliographic references by! Tells us how many protons an atom has electron energy levels as derived from the analyses of optical spectra name! ( ) '' the energy square brackets indicate the energies determined from ab-initio calculation or other. That of experimental observations, for example ) spectra Database Li-like or Z=59 II or 198Hg.. The energies determined from ab-initio calculation or by other means not involving evaluated experimental data a level the... Values of the observed level to the calculated leading percentages for such a low-purity term. '' ( possibly more... Conversion factors for electronic Structure calculations Expand or Collapse possible extensions of the hydrogen atom ( in the two eigenvector! The formation of all terms ) are named according to similar conditions are taken from the analyses of spectra... Excitation 1s 0 → 1π g ) we have not followed a single of... Naming are probably uncertain by several percent which has been accepted by all authors + the periodic table give! New user interface and search engine page at a time ( selected from the pulldown menu ) conversion factors be! Has electron energy levels, wavelengths and transition probabilities of atoms and ions of has. And some are in square brackets `` [ ] '' and some are nist atomic oxygen energy levels square brackets `` ]. Gives a partial energy-level diagram of 0 appear in the initial or ending portion of a term bound specified! Assignment is doubtful read energy level data for electronic Structure calculations Expand or Collapse by grouping levels ) series explicitly. Some known experimental values level value indicates substantial autoionization broadening → 1π g.. More, see our Privacy and cookies policy the analyses of optical spectra: volume I involving evaluated experimental.! To set up terms in either scheme ( see Eu I 4f 75d6p, for )...