PRESSURE BROADENING AND SHIFT OF SOME NH3 LINES IN THE NU(2) BAND

Pressure-induced line broadening and line shift of four rovibrational transitions in the nu(2) band of NH3 and of two unassigned transitions at 10 mu m were measured, using the wavelength-stabilized Cologne dio de laser spectrometer with an improved recording system. Self-effects and foreign gas effects caused by O-2, N-2, mixtures thereof, H2O, Ar, CO, and He have been investigated. Shift and broadening by the foreig n gas H2O were found to be much larger than the effects of the other f oreign gases. Thus, the effect of H2O contamination imposes a serious problem upon determining the pressure effects by other gases. For all lines, a Linear dependence of the shift and the broadening on the mixi ng ratio of the foreign gases O-2 and N-2 has been found. (C) 1996 Aca demic Press, Inc.