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NIST Atomic Spectra Database

Version History


Example of how to reference this online database:
Kramida, A., Ralchenko, Yu., Reader, J. and NIST ASD Team (2014). NIST Atomic Spectra Database (version 5.2), [Online]. Available: http://physics.nist.gov/asd [Wednesday, 22-Oct-2014 03:59:40 EDT]. National Institute of Standards and Technology, Gaithersburg, MD.
Citation Form:
Author/editor. (Year). Title (edition), [Type of medium]. Available: URL [Access date].

Version 5.2
September 2014
Additions, corrections, and improvements of the interface:
  • New interactive triangular data holdings diagrams added to the Lines and Levels Holdings web pages. The holdings can also be accessed from http://physics.nist.gov/asd/contents/lines and http://physics.nist.gov/asd/contents/levels.
  • Line sorting routines corrected in the database codes.
  • Error corrected in Saha-LTE ionization balance calculations, related to choice of a correct ionization limit in spectra with multiple limits.
  • Energy levels and spectral lines with classifications added/updated for Cr I-II and Cu I.
  • Energy levels, spectral lines, and transition probabilities added or updated for Fe V.
  • Transition probabilities added or updated for Al I-VII.
  • Line identifications corrected for Mn VI, Kr II, Rb X, Fr I
  • Observed and/or Ritz wavelengths corrected for O VII, Ne V, Ca I, Fe XV, Ag III, Xe IV, W I near the boundaries of the air wavelength range (2000 and 20000 Å).
  • Line strength and transition probability corrected for several forbidden transitions, two in C V, two in N VI, and three in O VII.
  • Several misprints corrected in various other spectra.
Version 5.1
September 2013
Additions, corrections, and minor improvements of the interface:
  • Wavelengths of ~200 unidentified lines of Fe I corrected.
  • Line references for Ne III corrected for all observed lines.
  • Errors in A values corrected for Sc I-II.
  • Energy levels and spectral lines added/updated for Ca III, Mn II, Fe II, Co II, Ag II, and In II.
  • Ionization Energies output page changed to display the ion charge instead of the spectrum number.
  • Levels and Lines Lists of Holdings modified to display triangular charts in addition to periodic table charts.
  • Several misprints corrected in various spectra.
Version 5.0.0
July 2012
Major update. New additions and corrections:
  • Added a new Web interface for retrieval of ionization energies and total binding energies of ground states of all atomic spectra. Ionization energies and ground states added or revised for all spectra of all elements up to Ds (Z=110). About 4900 of those ionization energies (5844 in total) are new, and about 400 have been updated. Uncertainties have been added or revised for all ionization energies.
  • Web interface of ASD is improved. Handling of the Spectrum field in Levels and Lines Search Forms is revised to conform to the standard used in the NIST Atomic Spectra Bibliographic Databases, which allows for searching of multiple spectra by isoelectronic sequence names, as well as by names of spectra and by ionic charge. Layout of the lines output is changed to approximate layouts used in atomic spectroscopy literature. Help pages contents are revised.
  • Energy levels and spectral lines with transition probabilities added/updated for Ne IV, Ti I-II, Sr II-XXXVIII, Cs III-LV, Ba III-LVI.
  • Energy levels corrected or added for O VI, Pm II, Tb II, Dy I-II, Ho I, Tm II, Lu I, Hf I, Ta II, Au I-II, Hg III-IV, Tl II-IV, Pb I-V, Bi I-II, Bi VI, Po I.
  • Energy level classifications added for prominent lines of Ge I-II, Ru II, Pd II, Nd I-II, Pm I-II, Sm I-II, Eu I-II, Gd I-II, Tb I-II, Dy I-II, Ho I-II, Er I-II, Tm I-II, Yb I-II, Lu I-II, Hf I-II, Ta I-II, Ir I-II, Au I-II, Tl I-II, Pb I-II, Bi I-II, Po I, At I, Rn I, Ra I-II.
  • Transition probabilities added or updated for Tc I-II, Ru I-II, Pd I-II, In I, Sb I-II, I I, Nd I-II, Sm I-II, Eu I-II, Gd I, Tb II, Dy I-II, Ho I-II, Er I-II, Tm I-II, Yb I-II, Lu I-II, Hf I-II, Tl II, Pb I-II, Bi I-II.
  • Missing observed intensities of 17 lines have been inserted from NIST Monograph 68 for Xe I.
  • Several duplicate transitions deleted in the line lists for Na VII, Si I, Ar II, K I, Fe I, Sr I, Te I-II.
  • A number of misprints corrected.
  • Default unit for output wavelengths changed from Ångström to nm.
Version 4.1.1
November 2011
Additions and corrections:
  • Transition probabilities added/updated for S I-XV.
  • Energy levels updated for Tc I, Ru II, Rh II, Ag I, Cd I, In I, Sn I, Sb I-II, Te I-II, I I.
  • Spectral line lists updated for Tc I-II, Ru I-II, Rh I-II, Pd I-II, Ag I, Cd I, In I, Sn I, Sb I-II, Te I-II, I I-II, Cs II.
  • Corrections made to line identifications and/or transition probability references for B III and Si I.
  • A number of misprints corrected
Version 4.1.0
May 2011
Major update. Additions and corrections:
  • Energy levels added for Ac III, Ag III, At I, Bi III-VI, Cd I-IV, Cs I-II, Hf I-II, I I-VIII, I XII-XIII, In I-V, Ir I-II, Nb I-VII, Nb XV, Os I-II, Pb I-II, Pd I-III, Po I, Pt I-II, Ra I-II, Re I-II, Rh I-III, Rn I-II, Ru I-III, Sb I-VI, Sn I-VI, Sr I-V, Sr XI-XII, Ta I-II, Tc I-II, Te I-VII, Tl I-II, Y I-V, Y XII-XIII, Zr I-II, Zr V-VI, Zr XIV.
  • Energy levels updated for 198Hg I, Ac I, Ag II, Ar II-III, Ar VII-XVII, Au I, Mo VI, W XIV, W XXIX, W XLI-LXXII.
  • Spectral lines added for Ar XII, Ar XV-XVIII, W LII, W LIV, W LVI-LXXII
  • Spectral lines updated for 198Hg I, Ar II-XI, Ar XIII-XIV, Mo VI, Sr I, W XIV, W XXIX, W XLIII-LI, W LV-LXIII, W LXV.
  • A number of misprints corrected
  • Some programmatic improvements were made
Version 4.0.1
November 2010
Corrections:
  • Several misprints fixed
  • Minor improvement in the help system
Version 4.0.0
September 2010
Major update. New additions and corrections:
  • Full integration with the NIST Atomic Spectra Bibliography Databases
  • Added support of isotope data
  • Added energy levels for Ag I-II, Au I-II, Ac I-II, Bi I-II
  • Added or updated spectral lines and energy levels for H, B, Ne, Na, K, Kr in all ionization stages, Hg I, Fe I-II, highly-charged ions of W
  • Added spectral lines and energy levels for isotopes D, T, 3He I, 10B I-II, 11B I-II, 198Hg I and energy levels only for 3He II, 39K I, 40K I, 41K I.
  • Added or updated transition probabilities for H through B in all ionization stages, C I-II, N I-II, Fe I-II
  • Updated conversion factors for transition probability parameters
  • A number of errors and/or misprints were fixed in various ions
Version 3.1.5
April 2008
New corrections:
  • energies of the high-n ns and nd levels in Rb I corrected
  • energies of the doubly-excited levels in Ar XVI corrected
  • minor bug fixes
Version 3.1.4
January 2008
New additions and corrections:
  • Ritz wavelengths and transition probabilities added for C VI and O VIII
  • energy levels and lines added/updated for Br IV
  • energy levels and lines added/updated for Ne V and VI
  • numerous corrections for bibliographic references for transition probabilities and lines
  • line 623.767 Å in Ar IV removed
Version 3.1.3
September 2007
New additions:
  • energy levels and lines added for Fr I (isotope 212Fr)
  • energy levels and lines added/updated for ions of Ga
  • comments field added for primary data source
  • total Doppler-broadened spectrum output (summed over all ionization stages) added
Version 3.1.2
April 2007
Error corrections:
  • corrected vacuum-air conversions for the multiplet output
  • observed wavelengths are now displayed for the singlet lines in the multiplet output
  • level 6p2 3P2 in Hg I is assigned energy 96190
  • 15- and 100-page outputs are removed
  • improved management of the popup windows (bibliography etc.)
  • several other minor error fixes and corrections
Version 3.1.1
March 2007
New additions and corrections:
  • direct query links to bibliographic databases are added for both level and line queries
  • citation information is now displayed on the query output pages
  • in He I, energy levels are corrected for 169 levels, Ritz wavelengths corrected for corresponding transitions
  • duplicate level 1s3s 1S0 removed in N VI
  • about 100 duplicate lines removed in various ions of Mg, Al, B, P, and S
  • about 400 A-values corrected for Si II (x 1e8)
  • energy corrected for the 2s22p4 level in Ar XI
  • number of references to transition probabilities and/or lines are corrected for ions of S, Mg, and Al
Version 3.1.0
July 2006
Major update and error fix version.
  • New comprehensive sets of data added for B II, Ne II, Ne III, Ne VIII, Kr I -- XXXVI
  • Data addition and updates for spectral lines of Al VI -- XII and Si I -- XIII
  • Energy levels for Nd II are updated
  • Level compositions added to Ho and Yb ions
  • Term grouping corrected in rare earth elements
  • Configuration notations corrected for 314 levels in Br I, Br II, Se XXIV, As XXIII, Dy II.
  • Core J-values corrected in 2p55f configuration in Al IV.
  • JcK notation corrected in some energy levels in Cl I.
  • Primary source of data added in the output.
  • Corrected observed/Ritz wavelength selection for line identification and Saha plots.
  • Minor style interface improvements.
Version 3.0.3
January 2006
Added new data for spectral lines of Na and Mg (all ionization stages). New feature: wavenumber range selection. Fixed incorrect conversion of air wavelengths to wavenumbers. Energy of the level 2p3p 3P0 in O III changed from 300239.93 to 300229.93 (misprint); the Ritz wavelengths of transitions related to this level are corrected as well.
Version 3.0.2
April 2005
Minor bugs are fixed. Energy of the level 25p 3P2 in Hg I changed from 88920.8 to 83920.8 (misprint). New features added: (i) output of the averaged term energy, (ii) wavenumber output for multiplets.
Version 3.0.1
March 2005
New data added for W I, W II, and Be II. Added Doppler broadening for the Saha/LTE spectrum and calculation of the partition function for arbitrary ions.
Version 3.0
February 2005
See Version 3.0-beta below. A detailed list of changes between Version 2.0 and Version 3.0 is available.
Version 3.0-beta
October 2004
The database management system has been completely replaced, and a new interface has been developed. New graphical capabilities have been added as well. Additions, revisions and updates to data, references, and texts have been completed.
Version 2.0
March 22, 1999
Contains transition data on the first 99 elements in the periodic table and energy level data for the first 28 elements plus Z = 42, 57-71. Data on transition probabilities, wavelengths, and energy levels are integrated and self consistent. A new database search engine and World Wide Web interface have been created.
Version 1.3
9 July 1999
Version 1.3 of ASD is maintained as an archive. The database was transferred from "aeldata.nist.gov" to "physics.nist.gov." "aeldata.nist.gov" now resides behind the NIST firewall and is no longer accessible to the public. At relocation time, the interface was redesigned to allow for easier access to the data. Also, the data tables were reformatted to save screen space making them easier to view.

Si I energy levels from Energy Levels of Silicon, Si I through Si XIV, W.C. Martin and R. Zalubas, J. Phys. Chem. Ref. Data 12, 323-380 (1983) are now available.

Version 1.2
13 March 1998
Si I energy levels are at present unavailable.

Si I energy levels contained in the database through 12 March 1998 were from unpublished measurements and data compiled at NIST (1993), which updated the published NIST energy level compilation, Energy Levels of Silicon, Si I through Si XIV, W.C. Martin and R. Zalubas, J. Phys. Chem. Ref. Data 12, 323-380 (1983).

Pending completion and publication of the 1993 work, the Si I energy levels will revert back to the published data in the next release.

Version 1.1
16 January 1996
References, ground states, and ionization energies have been added for all spectra for which other data are included. New energy level data have been added for Zn I-XXX and new wavelength data have been added for Fe XIV.
Version 1.0
28 March 1995
Official release, NIST approved version. Includes most of the existing recent critically evaluated NIST data on atomic energy levels, transition probabilities, and wavelengths. Energy level data are included for over 500 spectra for the elements Na through S, K through Ni, Cu, Ge, Kr, and Mo, La through Lu, and O II. Transition probability data are included for Sc through Ni. Wavelength data are included for O II, Mg, Al, S, and Sc.
Beta Version
3 January 1995
Unofficial release. Includes most of the existing recent critically evaluated NIST data on atomic energy levels, transition probabilities, and wavelengths. Energy level data are included for over 500 spectra for the elements Na through S, K through Ni, Cu, Ge, Kr, and Mo, La through Lu, and O II. Transition probability data are included for Sc through Ni. Wavelength data are included for O II, Mg, Al, S, and Sc.
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