Recent and Current Program of the NIST Atomic Spectroscopy
Data Centers:
Critically Evaluated Data and Bibliographies on Atomic Spectra -
Energy Levels, Wavelengths, Transition Probabilities, and Line Shapes
The Atomic Spectroscopy Data
Centers: Atomic Energy Levels and Wavelengths and the Atomic Transition
Probabilities and Spectral Line Shapes critically review, compile, and
disseminate data on energy levels, wavelengths and line classifications,
transition probabilities and oscillator strengths, and line shapes and
radiative lifetimes for the spectra of atoms and atomic ions in all stages of
ionization. The NIST data centers also publish annotated bibliographies and
maintain files on bibliographic references categorized by element, stage of
ionization, and technical content. The centers also maintain online
Atomic Spectroscopy Databases.
- Bibliographic Databases and Data Center Publications
- Available online is the
Atomic Transition Probability
Bibliographic Database and the
Atomic Spectral Line Broadening
Bibliographic Database.
There is also a searchable list of
Data Center Publications
including critical compilations, databases, reviews, and
bibliographies produced by the data centers.
- Energy-Level and Wavelength Compilations
- Energy-level data have been recently compiled for
O II, all spectra of the elements Na through S,
the iron-period elements K through Ni, all spectra of Cu, Zn, Ge, Kr, Mo,
and 63 spectra of the rare-earth elements, La through Lu.
Wavelength compilations based on these energy-level data have been
published for O II and all spectra of Mg, Al, S,
and Sc, with all wavelength regions being covered. A compilation of
wavelength data for high-ionization spectra of Ti, V, Cr, Mn, Fe, Co, Ni,
Cu, Kr, and Mo has been published.
Work is complete on the Handbook of Basic Atomic Spectroscopic
Data, which gives wavelengths and intensities for some 11,000 of
the stronger lines of the neutral and singly ionized atoms of 99 elements
(H through Es, Z = 1-99) along with energy levels and
transition probabilities (where available). This is now in press and will be
made available in three media forms; an electronic book (eBook),
Web database, and as a published handbook.
Wavelength and energy-level compilations for Ne I and all spectra of Ga, and Ar are almost complete. Work
is continuing on new or updated energy-level and wavelength compilations
for spectra of other elements from hydrogen through argon
(Z = 1 to 18) and completion of the noble
gases (Ne, Ar, Kr, Xe) monograph.
Work is beginning on the alkaline-earth metals (Rb, Sr, Ba), tungsten,
and Ni-like spectra.
- Transition Probability Compilations
- Recent critical compilations of atomic transition probabilities cover the
iron-group elements Sc through Ni and the light elements C, N, and O. Also,
a recent update of the tables previously published in the CRC Handbook
of Chemistry and Physics contains about 8300 selected lines of all
elements for which reliable data are available, mostly for neutral and
singly ionized atoms. A compilation for neutral and singly-ionized barium
has been completed and is now in press.
A critical compilation of prominent lines of neutral and singly ionized
heavy atoms is now being updated, and work is also continuing on evaluating
data for the remaining atoms and ions of H through Ne and Na through Ca.
For these spectra, calculations from the Opacity Project play a major role.
- Recent Line Shapes and Shifts Compilations
- Comprehensive critical reviews have been published for experimental
Stark widths and shifts for neutral and ionized atoms. These recent reviews
cover the time period from 1976 to 1988.
- Numeric Databases
- The
Atomic Spectra Database
(ASD) includes most of the existing critically evaluated NIST data on
atomic energy levels, transition probabilities, and wavelengths compiled by
the Atomic Spectroscopy Data Centers that are reasonably up-to-date.
ASD provides interactive capability that allows the user to choose the
element or elements of interest and the type of data to be displayed.
Default formats are also available for quick viewing of the data. The
database provides full search and filter capabilities.
Data are included for about
950 spectra and about 70,000 energy levels. There are wavelengths for about
91,000 lines from 1 Å to 200 µm, with transition
probabilities and estimated uncertainties for about half of these. Energy
level data are available for most ions of the elements from H through
Kr (Z = 1 to 36), Mo (Z = 42),
as well as the first five stages of ionization of the lanthanides
(Z = 57 to 71). Wavelength data are available for all
elements up to Es (Z = 1 to 99). For spectra of
H through Ni (Z = 1 to 28) the wavelengths are
accompanied by line classifications and transition probabilities.
Wavelength data from recent comprehensive NIST compilations of the spectra
of Mg, Al, S, Sc, Be I,
O II, and Ne I are also
included. For the first five spectra of other elements, wavelengths and
relative intensities for prominent lines without classifications as
originally published in Wavelengths and Transition Probabilities for
Atoms and Atomic Ions (NSRDS-NBS 68) and reprinted annually in the CRC
Handbook of Chemistry and Physics are given. References to the NIST
compilations and original data sources are listed in a bibliography.
Other Atomic Spectroscopy
Databases are currently available
(platinum,
ionization energies,
bibliographies) and new databases have recently been made available online
Spectral Data for the Chandra
X-ray Observatory and
Handbook of Basic Atomic
Spectroscopic Data.
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