A π, τ, π/2 type pulse sequence method for the determination of T1 in rotational transitions

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Abstract
We report a pulse sequence measurement of T1 in the J=0 → J=1 rotational transition in OCS in the pure gas, OCS–He mixtures, and OCS–CH3F mixtures at low pressures. This pulse sequence method is similar to the π, τ, π/2 pulse sequence used in nuclear magnetic resonance to measure T1. The pulse method of measuring T1 in rotational systems has several advantages over the analysis of transient absorption (transient nutation) results or the analysis of power broadened steady state absorption lines. We find T1=T2 for the J=0 → J=1 OCS transitions in pure OCS, OCS–He mixtures, and OCS–CH3F mixtures.