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NIST Atomic Spectra Database

Version History

Example of how to reference this online database:
Ralchenko, Yu., Kramida, A.E., Reader, J. and NIST ASD Team (2008). NIST Atomic Spectra Database (version 3.1.5), [Online]. Available: http://physics.nist.gov/asd3 [2009, January 18]. National Institute of Standards and Technology, Gaithersburg, MD.

Citation Form:
Author/editor. (Year). Title (edition), [Type of medium]. Available: URL [Access date].
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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