Abstract
The effect of cross relaxation due to inelastic collisions on the inversion doublets of ammonia in the far infrared was studied by interferometric spectroscopy. Line widths and cross-relaxation rates were measured for several rotational transitions, using CH 2 = CF 2, C 2H 6, CF 4 and SF 6 as perturbing gases in the pressure range from 1 to 17.5 atm. The J-dependence of the observed cross-relaxation rates was calculated using a first Born approximation.
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