H + CD 4 abstraction reaction dynamics

Product energy partitioning

Wenfang Hu, György Lendvay, Diego Troya, George C Schatz, Jon P. Camden, Hans A. Bechtel, Davida J A Brown, Marion R. Martin, Richard N. Zare

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

This paper presents experimental and theoretical studies of the product energy partitioning associated with the H + CD 4 (v = 0) → HD + CD 3 reaction for the collision energy range 0.5-3.0 eV. The theoretical results are based on quasiclassical trajectories from (1) first principles direct dynamics calculations (B3LYP/ 6-31G**), (2) an empirical surface developed by Espinosa-García [J. Chem. Phys. 2002, 116, 10664] (EG), and (3) two semiempirical surfaces (MSINDO and reparametrized MSINDO). We find that most of the energy appears in product translation at energies just above the reactive threshold; however, HD vibration and rotation become quite important at energies above 1 eV, each accounting for over 20% of the available energy above 1.5 eV, according to the B3LYP calculations. The barrier on the B3LYP surface, though being later than that on EG, predicts significantly higher HD vibrational excitation than EG. This deviation is contradictory to what would be expected on the basis of the Polanyi rules and derives from modest differences in the potential energy surfaces. The CD 3 internal energy is generally quite low, and we present detailed rotational state distributions which show that the CD 3 rotational distribution is largely independent of collision energy in the 0.75-1.95 eV range. The most populated rotational levels are N = 5 and 6 on B3LYP, with most of that excitation being associated with motion about the C 2 axes, rather than C 3 axis, of the CD 3 product, in good agreement with the experimental results. Through our extensive studies in this and previous work concerning the scattering dynamics, we conclude that B3LYP/6-31G** provides the best available description of the overall dynamics for the title reaction at relatively high collision energies.

Original languageEnglish
Pages (from-to)3017-3027
Number of pages11
JournalJournal of Physical Chemistry A
Volume110
Issue number9
DOIs
Publication statusPublished - Mar 9 2006

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products
Potential energy surfaces
energy
Trajectories
Scattering
collisions
rotational states
internal energy
excitation
potential energy
trajectories
deviation
vibration
thresholds
scattering

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Hu, W., Lendvay, G., Troya, D., Schatz, G. C., Camden, J. P., Bechtel, H. A., ... Zare, R. N. (2006). H + CD 4 abstraction reaction dynamics: Product energy partitioning. Journal of Physical Chemistry A, 110(9), 3017-3027. https://doi.org/10.1021/jp055017o

H + CD 4 abstraction reaction dynamics : Product energy partitioning. / Hu, Wenfang; Lendvay, György; Troya, Diego; Schatz, George C; Camden, Jon P.; Bechtel, Hans A.; Brown, Davida J A; Martin, Marion R.; Zare, Richard N.

In: Journal of Physical Chemistry A, Vol. 110, No. 9, 09.03.2006, p. 3017-3027.

Research output: Contribution to journalArticle

Hu, W, Lendvay, G, Troya, D, Schatz, GC, Camden, JP, Bechtel, HA, Brown, DJA, Martin, MR & Zare, RN 2006, 'H + CD 4 abstraction reaction dynamics: Product energy partitioning', Journal of Physical Chemistry A, vol. 110, no. 9, pp. 3017-3027. https://doi.org/10.1021/jp055017o
Hu, Wenfang ; Lendvay, György ; Troya, Diego ; Schatz, George C ; Camden, Jon P. ; Bechtel, Hans A. ; Brown, Davida J A ; Martin, Marion R. ; Zare, Richard N. / H + CD 4 abstraction reaction dynamics : Product energy partitioning. In: Journal of Physical Chemistry A. 2006 ; Vol. 110, No. 9. pp. 3017-3027.
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