Physics – Chemical Physics
Scientific paper
Oct 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974jchph..61.3155a&link_type=abstract
Journal of Chemical Physics, vol. 61, Oct. 15, 1974, p. 3155-3163. AEC-supported research
Physics
Chemical Physics
42
Electron Transitions, Formaldehyde, Interstellar Gas, Molecular Collisions, Molecular Rotation, S Matrix Theory, Atomic Collisions, Collision Parameters, Cosmic Dust, Hydrogen, Monte Carlo Method, Scattering Cross Sections
Scientific paper
The formalism necessary for the application of 'classical S-matrix' theory to collisions of an atom with a rigid asymmetric rotor is derived. This is applied to rotational excitation of formaldehyde by H2 (taken to be spherically symmetric) at energies from 10 to 15 K. Classical Monte Carlo trajectory calculations were also carried out for the same system in the energy range from 10 to 40 K. The results support the proposal of Townes and Cheung (1969) that a collisional mechanism is responsible for the 111 to 110 anomalous absorption of formaldehyde in cool interstellar dust clouds.
Augustin S. D.
Miller Warner H.
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