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Cross sections for rotationally inelastic scattering of HCO. II. Collisions with CO, N, O, and H

The Journal of Chemical Physics, ISSN: 0021-9606, Vol: 86, Issue: 8, Page: 4461-4470
1987
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Cross sections for ΔJ = 0, ± 1, and ± 2 transitions in the K = 1 ladder of formaldehyde (HCO) in collision with CO, N, O, and H are measured in a double-resonance beam maser. The dependence of the cross sections on detection angle, relative velocity, and H temperature is investigated. The experimental cross sections are confronted with calculations in modified Anderson theory and adiabatically corrected sudden approximation. For CO and N scattering dipole-quadrupole interaction dominates, a large fraction of the integral cross section is probed and agreement with theory is good. For O and H scattering also induction and dispersion forces are important; agreement with theory is less satisfactory indicating that the full potential, including the repulsive part, should be taken into account. © 1987 American Institute of Physics.

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