Coupled states calculations on vibrational relaxation in He+CO2(0110) and He+CO

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Abstract
Computations of vibrational relaxation rate coefficients for He+CO2 (0110) and He+CO (ν=1) over the temperature range 100–300 K are reported. The calculations used the quantum mechanical coupled‐channel method for vibrations and the coupled states approximation (CSA) for rotations. These calculations were used to test the accuracy of the vibrationally close coupled, rotationally infinite order sudden approximation (VCC‐IOSA) and a semiclassical method. For He+CO2, the VCC‐IOSA results compare very well with those obtained using the CSA, while the agreement is not so good for He+CO. This is because CO has a much larger rotational constant and vibrational frequency than CO2.