“…Also the other methanol isotopomers, including 13 CH 3 OH, have proved to be very prolific FIR laser sources. The first FIR laser emissions of 13 CH 3 OH were reported by Henningsen and Petersen in 1978 [2], and more than 200 FIR laser lines have been reported in literature [3][4][5][6][7][8][9][10][11]. As with the parent species, a systematic analysis of high-resolution Fourier-transform (FT) absorption spectra of this isotopomer in the FIR and IR regions has led to the assignment of many of the FIR laser emissions.…”