Abstract
An analysis is made of rotational relaxation in a molecular system under conditions of saturation of a vibrational--rotational transition. It is shown that for molecules having large dipole moments of vibrational transitions, the rotational relaxation is not due to an ''impact'' mechanism but to the dipole--dipole interaction between the colliding molecules. On the basis of qualitative concepts, it is established that under certain conditions the relaxation caused by the dipole--dipole interaction may be essentially nondiffusive. An estimate is made of the cross section of the elementary event using the proposed relaxation model for NF/sub 3/, CO/sub 2/, CF/sub 4/, SF/sub 6/, and UF/sub 6/ molecules. These cross sections are considerably larger than the gas-kinetic cross sections.
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