A continuously tunable 12CH3F Raman FIR laser has been used to measure the high J-number portion of the CH3CI pure rotation spectrum and also a sequence of two-photon transitions in the pure rotation spectrum of 12CH3F. New FIR laser emissions from CH3CI are also reported.
Wen-sen Zhu, Wen-sen Zhu,
"FIR laser experiments with CH3CI and CH3F", Proc. SPIE 1514, 15th International Conference on Infrared and Millimeter Waves, 15146X (1 December 1990); doi: 10.1117/12.2301659; https://doi.org/10.1117/12.2301659