A quasiclassical trajectory study of product energy and angular distributions in OH + H2 (D2)

Kimberly S. Bradley, George C Schatz

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Abstract

We present a quasiclassical trajectory study of OH + H2 → H2O + H and its D2 counterpart using the Schatz-Elgersma semiempirical potential surface. Emphasis in the work has been on using an accurate determination of the H2O vibrational actions to calculate product vibrational state distributions. Other aspects of the product energy and angular distributions have also been studied so as to make comparisons with recent molecular beam and laser experiments and with other calculations. The OH + H2 results generally confirm earlier calculations by Schatz and Elgersma, but the vibrational distributions are somewhat different, indicating that the earlier perturbation theory-based calculations were not completely converged. The calculated OH + H2(D2) integral cross sections are in good agreement at energies close to the reactive threshold with quantum calculations due to Nyman and Clary. Comparisons with recent measurements by Koppe et al. indicate good agreement for OH + D2 but not as good for OH + H2. The OH + D2 product angular distributions are in good agreement with measurements by Casavecchia and co-workers, but the fraction of energy in translation is significantly higher (0.45 vs 0.32). Nyman and Clary's fraction of energy in translation for the same potential energy surface is higher still (0.71). Their calculation leaves out HOD rotation, which may explain the differences between the two theoretical estimates. The difference between theory and experiment is probably due to inaccurate energy release behavior in the potential surface, with too little energy going to product vibration.

Original languageEnglish
Pages (from-to)3788-3795
Number of pages8
JournalJournal of Physical Chemistry
Volume98
Issue number14
Publication statusPublished - 1994

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Angular distribution
energy distribution
angular distribution
Trajectories
trajectories
products
Surface potential
energy
Potential energy surfaces
Molecular beams
vibrational states
leaves
molecular beams
perturbation theory
Experiments
potential energy
vibration
thresholds
Lasers
cross sections

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

A quasiclassical trajectory study of product energy and angular distributions in OH + H2 (D2). / Bradley, Kimberly S.; Schatz, George C.

In: Journal of Physical Chemistry, Vol. 98, No. 14, 1994, p. 3788-3795.

Research output: Contribution to journalArticle

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