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Polarization relaxation times (T2) have been measured for the J=6, 9, and 10 l-doublet transitions in the (0110) vibrational level of HCN by means of microwave transient emission. Also, T2 values for relaxation induced by He, H2, and CH3F are obtained for the J=6 transition. The dephasing cross sections for foreign gas collisions are consistent with the force laws operative in each case. The HCN–H2 result provides a comparison with the recently measured cross section of the isoelectronic molecular ion system, HCO+–H2, and confirms the prediction of Green that rotational relaxation rates are only moderately faster for molecular ions.
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Charròn et al. (1980) studied this question.
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