| Summary: | The energy-corrected-sudden (ECS) scaling theory is extended to vibrational relaxation in the collisions of anharmonic linear triatomic molecules with atoms. Application is made to the collisions of He atoms with 12C 16O2, 14C 16O2, and 12C 18O2. By combining the rate constants for the (0110→00°0) transitions, calculated using the vibrational close-coupling rotational infinite-order-sudden (VCC-IOS) method, with the ECS scaling theory, we predict rate constants for the transitions (10°0→0110), (0220→0110), and (02°0→0110). These agree very well with the rate constants computed directly using the VCC-IOS technique. This comparison presents a particularly severe test of the accuracy of the ECS scaling theory for anharmonic polyatomics since Fermi resonance effects are large for the 10°0 and 02°0 levels in CO2. © 1983 American Institute of Physics.
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