State-selective studies of T→R, V energy transfer: The H+CO system

G. K. Chawla*, G. C. McBane, P. L. Houston, G. C. Schatz

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

37 Scopus citations


Collisional energy transfer from H atoms to CO (v = 0, J ≃ 2) has been studied at a collision energy of 1.58 ± 0.07 eV by photolyzing H 2S at 222 nm in a nozzle expansion with CO and probing the CO(v″, J″) levels using tunable VUV laser-induced fluorescence. The ratio CO(v″ = 1)/CO(v″=0) is found to be 0.1 ± 0.008. The rotational distribution of CO(v″=0) peaks J″≤11 and decays gradually; population is still observed at J″≥45. The rotational distribution of CO (v″ = 1) is broad and peaks near J″ = 20. The experimental results are compared to quasiclassical trajectory calculations performed both on the H + CO surface of Bowman, Bittman, and Harding (BBH) and on the surface of Murrell and Rodriguez (MR). The experimental rotational distributions, particularly those for CO(v″ = 1), show that the BBH surface is a better model than the MR surface. The most significant difference between the two surfaces appears to be that for energetically accessible regions of configuration space the derivative of the potential with respect to the CO distance is appreciable only in the HCO valley for the BBH surface, but is large for all H atom approaches in the MR potential. Because the H-CO geometry is bent in this valley, vibrational excitation on the BBH surface is accompanied by appreciable rotational excitation, as observed experimentally.

Original languageEnglish (US)
Pages (from-to)5481-5488
Number of pages8
JournalThe Journal of Chemical Physics
Issue number9
StatePublished - 1988

ASJC Scopus subject areas

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


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