Coupled states cross sections for rotational excitation of H2CO by He impact at interstellar temperatures

Barbara Jane Garrison, William A. Lester

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


Cross sections for rotational excitation of ortho formaldehyde due to collision with helium are computed following the coupled states (CS) formalism and compared with recent coupled channel (CC) results obtained employing the same ab initio configuration interaction intermolecular potential. The CS equations are integrated at 9 scattering energies between 25 and 95°K using a basis set of 16 ortho H2CO states (1 ≤ j ≤ 5). The CS procedure with the orbital angular momentum quantum number l set equal to the total angular momentum J yields the correct order of magnitude for scattering cross sections. Qualitative differences are found, however, in the energy dependence of some inelastic transitions.

Original languageEnglish (US)
Pages (from-to)531-536
Number of pages6
JournalThe Journal of chemical physics
Issue number2
StatePublished - Dec 1 1976

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry


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