Line broadening of oxygen in the microwave region at low pressures

Abstract

Measurements of the line widths of OCS in the microwave region at low pressures and at room temperatures were performed applying the enancetron technique to a video spectrometer. The rotational transitions 1 → 2, 2 → 3, 3 → 4, 4 → 5, 5 → 6 and 9 → 10 were analysed and compared with the predictions of a modified Anderson-Tsao-Curnutte theory. A good agreement is obtained between our theoretical and experimental results considering dipole-dipole, dipole-quadrupole and quadrupole-quadrupole interactions. To obtain this good agreement between experimental and theoretical results, the quadrupole of OCS was assumed to be 1.35·10−26 e.s.u.