Investigation of T1-Relaxation for OCS Rotational Transitions by Self-and Nonpolar Foreign Gas Collision

Abstract

Abstract The pressure dependence of 1/T1 has been measured at temperatures ≅ 300 K and ≅ 200 K for the carbonyl sulfide J,|M| = (0, 0)-(1, 0), (1, 0)-(2, 0), (1, 1)-(2, 1), (2, 0)-(3, 0), (2, 1)-(3, 1) and (2, 2)-(3, 2) rotational transitions by using a π, τ, π/2 pulse sequence method. T1 relaxation has been investigated for the pure gas and mixtures with He, Ne, Ar, Kr, H2, O2, N2 and CO2. The effects of molecular motion are discussed theoretically by considering the microwave field inhomogeneity and collisions of molecules with the walls of the sample cell.