The measurement and interpretation of T1 and T2 in the inversion doublets of 15NH3 and the rotational transitions in OCS

Abstract

Transient experiments have been completed to measure T₁ and T₂ as a function of pressure for the inversion transitions in several (J,K,‖M‖ =J) states in ¹⁵NH₃ and in the J=1→J=2, M=±1 transitions in OCS. In OCS, T₁=T₂ for both the J=0→J=1, M=0 and J=1→J=2, M=±1 transitions. In NH₃, however, the ratio T₂/T₁ varies over the range 1.0?T₂/T₁?2. These results are interpreted using a modified form for the Anderson theory of line broadening. Comparisons are made between the results of this work and earlier steady state double resonance work.