State-selective studies of T→R, V energy transfer

The H+CO system

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

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

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
Pages (from-to)5481-5488
Number of pages8
JournalJournal of Chemical Physics
Volume88
Issue number9
Publication statusPublished - 1988

Fingerprint

Carbon Monoxide
Energy transfer
energy transfer
valleys
tunable lasers
laser induced fluorescence
nozzles
excitation
atoms
Atoms
Laser tuning
trajectories
collisions
expansion
Nozzles
decay
geometry
configurations
Fluorescence
Trajectories

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Chawla, G. K., McBane, G. C., Houston, P. L., & Schatz, G. C. (1988). State-selective studies of T→R, V energy transfer: The H+CO system. Journal of Chemical Physics, 88(9), 5481-5488.

State-selective studies of T→R, V energy transfer : The H+CO system. / Chawla, G. K.; McBane, G. C.; Houston, P. L.; Schatz, George C.

In: Journal of Chemical Physics, Vol. 88, No. 9, 1988, p. 5481-5488.

Research output: Contribution to journalArticle

Chawla, GK, McBane, GC, Houston, PL & Schatz, GC 1988, 'State-selective studies of T→R, V energy transfer: The H+CO system', Journal of Chemical Physics, vol. 88, no. 9, pp. 5481-5488.
Chawla, G. K. ; McBane, G. C. ; Houston, P. L. ; Schatz, George C. / State-selective studies of T→R, V energy transfer : The H+CO system. In: Journal of Chemical Physics. 1988 ; Vol. 88, No. 9. pp. 5481-5488.
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