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The HEASARC is a multi-mission astronomy archive for the EUV, X-ray, and Gamma ray wave bands. Because EUV, X and Gamma rays cannot reach the Earth's surface it is necessary to place the telescopes and sensors on spacecraft. The HEASARC now holds the data from 25 observatories covering over 30 years of X-ray, extreme-ultraviolet and gamma-ray astronomy. Data and software from many of the older missions were restored by the HEASARC staff. Examples of these archived missions include ASCA, BeppoSAX, Chandra, Compton GRO, HEAO 1, Einstein Observatory (HEAO 2), EUVE, EXOSAT, HETE-2, INTEGRAL, ROSAT, Rossi XTE, Suzaku, Swift, and XMM-Newton.
>>>!!!<<< 2019-12-03: The repository is no longer available >>>!!!<<< Please use https://www.cfa.harvard.edu/amp/ampdata/kurucz23/sekur.html 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).