Coupled-channel study of rotational excitation of a rigid asymmetric top by atom impact - /H2CO,He/ at interstellar temperatures

Details Coupled-channel study of rotational excitation of a rigid asymmetric top by atom impact - /H2CO,He/ at interstellar temperatures Coupled-channel study of rotational excitation of a rigid asymmetric top by atom impact - /H2CO,He/ at interstellar temperatures

Sep 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jchph..65.2193g&link_type=abstract

Journal of Chemical Physics, vol. 65, Sept. 15, 1976, p. 2193-2200.

Physics

Chemical Physics

34

Atomic Collisions, Formaldehyde, Interstellar Matter, Molecular Collisions, Molecular Energy Levels, Molecular Excitation, Collision Rates, Energy Transfer, Fine Structure, Inelastic Scattering, Molecular Absorption, Molecular Rotation, Potential Energy, Quantum Mechanics, Scattering Cross Sections, Wave Functions

Scientific paper

A collisional pumping model for the cooling of the 6 and 2 cm doublets of interstellar formaldehyde is tested by means of a quantum mechanical scattering study. A formalism covering the collision of an s-state atom with a rigid asymmetric top molecule is applied to the rotational excitation of ortho formaldehyde by helium impact. The coupled channel equations are integrated at 12 scattering energies between 20 and 95 K for the collision. Up to 16 ortho formaldehyde states are retained to test convergence of the computed cross sections, and resonance structure is obtained at 20.2, 32.7 and 47.7 K. It is found that the 6 and 2 cm doublets are cooled only upon inclusion of the j-3 doublet.

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