Discovery and frequency measurement of far-infrared laser emissions generated by optically pumped CH2DOH

A recently improved three-laser heterodyne system was used to frequency measure ten previously observed optically pumped far-infrared (FIR) laser emissions from the partially deuterated methanol isotopologue CH2DOH. Also, a 64.0 μm FIR emission generated by the 9P32 line of the carbon dioxide (CO2) laser was discovered and frequency measured. These newly measured frequencies have fractional uncertainties on the order of ±2×10-7 and correspond to laser wavelengths ranging from 42.6 to 152.7 μm. The offset frequency for the CO2 pump laser was measured for twenty-two CH2DOH FIR laser emissions.