British Mass Spectroscopy Society (BMSS)
Chemical Physics Group at Birmingham University
Computational optical and discharge physics at university of Illinois
DiRef searchable database of diatomic molecule spectra and theory
International spectrum file transfer protocol (JCAMP)
KITT PEAK NATIONAL OBSERVATORY
Lisy, James: group, University of Illinois at Urbana-Champaign
Molecular Spectroscopic Constants Database, Outline of
National Institute of Materials and Chemical Research, Japan, Database
Nist
Triatomic Spectral Database
NASA Astrophysics data system - a REALLY REALLY USEFUL search engine for molecular ion spectroscopy
SAM (Systematic, Accurate, Multiconfiguration calculations) PROJECT
spectroscopy-group mailing list
Spectroscopy sites, Useful index to
Spectrum simulation courtesy of Colin Western at Bristol Chemistry
Steacie Institute for Molecular Sciences, Canada (formerly the Herzberg institute)
Weizmann Institute of Sciences Plasma Group (useful list of links for spectroscopy)