Abstract
The pressure dependence of 1/T1 has been measured with a bridge type superhet spectrometer at room temperature for the rotational transitions (J, |M| ) = (1, 0)-(2, 0), (1, 1)-(2, 1), (2, 0) -(3,0), (2. 1)-(3, 1) and (2, 2)-(3, 2) of cyanoacetylene. HCCC15N. by using a π, τ, π/2 microwave pulse sequence method. In addition to the measurements on the pure gas, T1-relaxation has also been investigated for mixtures with H2, He, Ne and Ar. The results are used to derive linear combinations of rate constants for collision-induced transfer of rotational energy between |M| - resolved rotational levels of HCCC15N.
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