PUMP LASER OFFSET FREQUENCIES FOR CH3F

The frequencies of the (Q)Q(12, 1) and the (Q)Q(12, 2) transitions in the V3 band of (CH3F)-C-12 and the frequency of the (Q)R(4, 3) transit ion in the nu3 band of (CH3F)-C-13 have been measured to an accuracy o f +/-0.1 MHz relative to the 9P(20) and 9P(32) (CO2)-C-12 laser freque ncies, respectively, by using them as the pump transitions in three-le vel double resonance experiments with both copropagating and counterpr opagating beams. The frequencies of several transitions in the 2nu3-nu 3 bands of these molecules were also measured to this accuracy by usin g them as the probe transitions in either three-level or four-level do uble resonance experiments. (C) 1994 Academic Press, Inc.