Home page of the I. Physikalisches Institut der Universität zu Köln
The laboratory spectroscopy page
Some spectroscopy groups and persons:
The Virtual Atomic and Molecular Data Centre (VAMDC)
The JPL millimeter and submillimeter spectroscopy page
NIST Physical Reference Data.
The NIST recommended rest frequencies search form
The HITRAN database.
The GEISA database.
The ExoMol database.
Dave Woon's Astrochymist web page.
Astrophysics Data System abstract and article service at CDS or at ESO.
PSIgate Physical Sciences Information Gateway.