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Nuclear spin-lattice relaxation times T1 have been measured for 13C in 13C16O in pure CO gas and in CO in Ar, Kr, Xe, N2, O2, CO2, HCl, CH4, and SF6 gases as a function of temperature. The relaxation is completely dominated by the spin-rotation mechanism so that empirical values of the cross sections for rotational angular momentum transfer σJ are obtained as a function of temperature.
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Jameson et al. (1986) studied this question.
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