Centrifugal Distortion Analysis and Study of T 2 -Relaxation for l-Type Doublet Transitions of Nitrous Oxide ( 15N2O) by a Microwave Pulse Technique

Abstract

We investigated l-type doublet transitions of 15N20 in the first excited state of the degenerate bending vibration v2 with 14 < J < 34. From analysis of the J-dependence of the line center frequencies, the doubling constant q(0) was obtained together with the first and second order centrifugal distortion constants q(1) and q(2) respectively. For the lines in the J-band (4 to 8.2 GHz) and K-band (18 to 26.5 GHz) we have also investigated the pressure broadening due to self-collisions with use of the transient emission technique. The experimental results for the pressure broadening parameter Γp are compared with predictions from binary collision theory, based on the modified Murphy-Boggs perturbative treatment.