NIST Molecular Spectra Databases
Three databases of diatomic, triatomic, & hydrocarbon molecules originally published as spectral tables in the Journal of Physical and Chemical Reference Data. Each covers the microwave region with some data for the radio frequency region. Rotational spectral lines for 121 diatomic molecules, 55 triatomic molecules, & 91 hydrocarbons have been tabulated. Every entry: the isotopic molecular species, assigned quantum numbers, observed frequency, estimated measurement uncertainty, & references.