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Atomic Spectra Database (ASD) Find data for radiative transitions and energy levels in atoms and atomic ions More information is available at physics.nist.gov/cgi-bin/AtData/main_asd Department of Commerce (DOC)-National Institutes of Standards and Technology (NIST) The database contains data for radiative transitions and energy levels in atoms and atomic ions. Data are included for observed transitions of 99 elements and energy levels of 52 elements. ASD contains data on about 900 spectra from about 1 Angstroms to 200 micrometers, with about 70,000 energy levels and 91,000 lines, 40,000 of which have transition probabilities listed. The most current NIST-evaluated data associated with each transition are integrated under a single listing. Energy level data are included for most spectra of H-Kr (Z=1-36), Mo (Z=42), plus up to the first five spectra of the lanthanide rare earths (Z=57-71). Classified lines with transition probabilities are included for most spectra of H-Ni (Z=1-28), including new extensive transition probabilities for C, N, and O; output for these can be ordered by either multiplet (for a given spectrum) or wavelength. Also, prominent lines (unclassified) with wavelengths and relative intensities are included for up to the first five spectra of H-Es (Z=1-99). Some transition probabilities are listed for selected lines of Cu-Es (Z=29-99). Comprehensive wavelength lists of observed lines with relative intensities are incorporated for all spectra of Mg, Al, S, Sc, plus Be I, O II, and Ne I. Each page of the ASD database (except the ASD home page) includes a menu bar displayed at the top of the page which can be used to navigate through the database. Navigating through the database using the menu bar (or by using the links displayed on the ASD home page) saves output preferences and search criteria, so that each time the Lines Form or Levels Form is displayed it is filled out with the preferences and criteria from the previous search. For more specific information on moving around within the ASD database, see the navigation section of the Help file. The List of Spectra page provides a textual description of the contents of the database, a detailed table of included elements and ionization stages and access to the lists of Holdings for Spectral Line and Energy Level Data. The database includes a variety of output options and search criteria. Keywords: Chemistry-General; Physics-General Resource tags: Data; Online searching of information
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