The atomic line data used in this database are taken from Bob Kurucz' CD-ROM 23 of spectroscopic line calculations. The database contains all lines of the file "gfall.dat" with the following items for each line: Wavelength; loggf; element code; lower level: energy, J, configuration; upper level: energy, J, configuration; gamma r; gamma s; gamma w; reference code.
CD-ROM 23 has all the atomic line data with good wavelengths in one large file and in one file for each species. The big file is also divided into 10 nm and 100 nm sections for convenience. Also given are hyperfine line lists for neutral Sc, V, Mn, and Co that were produced by splitting all the energy levels for which laboratory data are available (only a small fraction).
The concept behind this search interface and also the ideas behind the type of compression used to store the data are influenced to a large part by the earlier work of Andreas Bard, currently at NIST, Gaithersburg, MD, and Dietmar Engelke, now at PTB, Braunschweig, Germany.
Original Readme File to Kurucz' CD-ROM23: https://www.cfa.harvard.edu/amp/ampdata/kurucz23/gfreadme.dat ;
Link to CfA-server: https://www.cfa.harvard.edu/amp/ampdata/kurucz23/sekur.html