Rotational inelastic cross sections for two atomndash;rigid rotor systems,4He+H2(j) and4He+I2ast; (j), have been calculated using a quantal sudden approximation that we term the sudden rotation approximation. Vibrational inelastic cross sections have also been calculated for4He+H2(ngr;,j) using a two and three vibration basis set for total energies between 1.2 and 4.2 eV. The present results for4He+H2are compared with the coupled channel and coupled states results of McGuire and Kouri and with the two vibration results of McGuire. The4He+I2ast; results are compared with quasiclassical trajectory calculations and the experiments of Steinfeld and cohyphen;workers.
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