NEW FIR LASER EMISSIONS FOR METHANOL ISOTOPOMERS PUMPED WITH THE NEW BOULDER $CO_{2}$ LASER

Author Institution: Molecular Physics Division, National Institute of Standards and Technology; CEMAID \& Physics Department, University of New Brunswick; Depto, de EletroGnica QuaGntica, Instituto de Fisica; Time and Frequency Division, National Institute of Standards and TechnologyRecently, the number of $CO_{2}$ laser lines available for optical pumping of far-infrared (FIR) lasers has been significantly increased by the development of a new cw $CO_{2}$ laser at the Time and Frequency Division of the National Institute of Standards and Technology in Boulder. This system operates on very high J lines of the normal bands as well as on sequence and new hot-band lines, and has so far generated numerous new FIR laser transitions for $CH_{3}OH, ^{13}CH_{3}OH$ and $CD_{3}OH$. These include the new 123 $\mu m $ world-record holder from $CH_{3}OH$, pumped by the 9HP(20)hot-band $CO_{2}$ line, which is now the most efficient known FIR laser line, In this paper, we discuss experimental details and spectroscopic assignments for a number of the energy level systems associated with these transitions