Clary and Green 1987

Clary, D.C., and S. Green, 1987: Test of a modified sudden approximation for rotational excitation in He + CH₃CN. Chem. Phys., 112, 15-22, doi:10.1016/0301-0104(87)85018-8.

A description is given of a quantum-mechanical approximation specially adapted for the inexpensive calculation of cross sections for the rotational excitation of prolate symmetric top molecules in collisions with atoms. The method involves a coupled-channel expansion in basis functions which are labelled by the symmetric top projection quantum number k and are function of the azimuthal orientation angle phi. The infinite-order sudden approximation is applied to the total angular momentum of the molecule. The method is used in calculating cross sections and rate constants for the low-energy collisions of CH₃CN molecules with He atoms. These results compare well with those computed using the coupled-states approximation, and the agreement is superior to that obtained using the infinite-order sudden approximation for both the total and the azimuthal angular momentum of the molecule.

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Clary, D.C., and Green, S.: Test of a modified sudden approximation for rotational excitation in He + CH₃CN, Chem. Phys., 112, 15-22, doi:10.1016/0301-0104(87)85018-8, 1987.

Clary, D.C., and S. Green (1987), Test of a modified sudden approximation for rotational excitation in He + CH₃CN, Chem. Phys., 112, 15-22, doi:10.1016/0301-0104(87)85018-8.

Clary, D.C., and S. Green, 1987: Test of a modified sudden approximation for rotational excitation in He + CH₃CN. Chem. Phys., 112, 15-22, doi:10.1016/0301-0104(87)85018-8.

Clary, D.C., & Green, S. 1987, Chem. Phys., 112, 15, doi:10.1016/0301-0104(87)85018-8.

Clary DC, Green S. Test of a modified sudden approximation for rotational excitation in He + CH₃CN, Chem Phys 1987;112:15-22. doi:10.1016/0301-0104(87)85018-8.

D.C. Clary, S. Green, Chem. Phys. 112, 15-22, doi:10.1016/0301-0104(87)85018-8 (1987).