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Spectroscopic Databases:
Atomic
Atomic Database Listing (Yuri Ralchenko, Plasma Laboratory Weizmann Institute of Science)
BIBL: spectral bibliography database, Institute of Spectroscopy, Russia
Harvard - Smithsonian Center For Astrophysics: Databases of Atomic & Molecular Data for Astronomy
R.L. Kurucz Atomic Linelist : data from Kurucz CD-ROM 23
Molecular
HITRAN: High Resolution Transmission Molecular Absorption Database (1996 Revision)
NIST: Recommended Rest Frequencies for Observed Interstellar Molecular Microwave Transitions (1991 Revision) F.J. Lovas
NIST: Wavenumber Calibration Tables From Heterodyne Frequency Measurements (Special Publication 821) Arthur G. Maki and Joseph S. Wells
The Smithsonian Astrophysical Observatory line database SAO92
Jet Propulsion Laboratory Molecular Spectroscopy Catalog (Revision 4)
NASA ADC: list of atomic and molecular data files
CfA Molecular Data: VUV cross sections, energy levels and wavelengths (ASCII files)