High-resolution FTIR spectroscopy of the C-N stretching band of CH3NH2 has permitted location of several coincidences with CO2 laser lines, and identification of FIR laser transitions optically pumped by these lines. With the use of previous FIR spectroscopic results, it has been possible to form closed frequency combination loops to support the assignment of one of the IR-pump/FIR laser transition systems and improve the accuracy of one of the FIR laser frequencies.
R. M. Lees,
"FAR Infrared Laser Assignments For Methylamine", Proc. SPIE 1039, 13th Intl Conf on Infrared and Millimeter Waves, (18 November 1989); doi: 10.1117/12.978488; https://doi.org/10.1117/12.978488