Mode-Specific Quasiclassical Dynamics of the F- + CH3I SN2 and Proton-Transfer Reactions

Balázs Olasz, G. Czakó

Research output: Contribution to journalArticle

Abstract

Mode-specific quasiclassical trajectory computations are performed for the F- + CH3I(vk = 0, 1) SN2 and proton-transfer reactions at nine different collision energies in the range of 1.0-35.3 kcal/mol using a full-dimensional high-level ab initio analytical potential energy surface with ground-state and excited CI stretching (v3), CH3 rocking (v6), CH3 umbrella (v2), CH3 deformation (v5), CH symmetric stretching (v1), and CH asymmetric stretching (v4) initial vibrational modes. Millions of trajectories provide statistically definitive mode-specific cross sections, opacity functions, scattering angle distributions, and product internal energy distributions. The excitation functions reveal slight vibrational SN2 inversion inhibition/enhancement at low/high collision energies (Ecoll), whereas large decaying-with-Ecoll vibrational enhancement effects for the SN2 retention (double inversion) and proton-transfer channels. The most efficient vibrational enhancement is found by exciting the CI stretching (high Ecoll) for SN2 inversion and the CH stretching modes (low Ecoll) for double inversion and proton transfer. Mode-specific effects do not show up in the scattering angle distributions and do blue-shift the hot/cold SN2/proton-transfer product internal energies.

Original languageEnglish
Pages (from-to)8143-8151
Number of pages9
JournalJournal of Physical Chemistry A
Volume122
Issue number41
DOIs
Publication statusPublished - Oct 18 2018

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Proton transfer
Stretching
protons
inversions
methylidyne
internal energy
augmentation
Trajectories
trajectories
Scattering
Potential energy surfaces
collisions
scattering functions
Opacity
products
opacity
blue shift
Ground state
vibration mode
energy distribution

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Mode-Specific Quasiclassical Dynamics of the F- + CH3I SN2 and Proton-Transfer Reactions. / Olasz, Balázs; Czakó, G.

In: Journal of Physical Chemistry A, Vol. 122, No. 41, 18.10.2018, p. 8143-8151.

Research output: Contribution to journalArticle

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