Sudden rotation calculations of atom–molecule scattering

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Abstract
Rotational inelastic cross sections for two atom–rigid rotor systems, 4He+H2(j) and 4He+I2* (j), have been calculated using a quantal sudden approximation that we term the sudden rotation approximation. Vibrational inelastic cross sections have also been calculated for 4He+H2(ν,j) using a two and three vibration basis set for total energies between 1.2 and 4.2 eV. The present results for 4He+H2 are compared with the coupled channel and coupled states results of McGuire and Kouri and with the two vibration results of McGuire. The 4He+I2* results are compared with quasiclassical trajectory calculations and the experiments of Steinfeld and co‐workers.

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