Propargyl + O2 Reaction in Helium Droplets: Entrance Channel Barrier or Not?

Moradi, Christopher P.; Morrison, Alexander M.; Klippenstein, Stephen J.; Goldsmith, C. Franklin; Douberly, Gary E.

doi:10.1021/jp407652f

Title: Propargyl + O₂ Reaction in Helium Droplets: Entrance Channel Barrier or Not?

Journal Article · Mon Sep 09 00:00:00 EDT 2013 · Journal of Physical Chemistry. A, Molecules, Spectroscopy, Kinetics, Environment, and General Theory

DOI:https://doi.org/10.1021/jp407652f· OSTI ID:1409049

Moradi, Christopher P. ^[1]; Morrison, Alexander M. ^[1]; Klippenstein, Stephen J. ^[2]; Goldsmith, C. Franklin ^[2];

^[1]

Univ. of Georgia, Athens, GA (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)

A combination of liquid He droplet experiments and multireference electronic structure calculations is used to probe the potential energy surface for the reaction between the propargyl radical and O₂. Infrared laser spectroscopy is used to probe the outcome of the low temperature, liquid He-mediated reaction. Bands in the spectrum are assigned to the acetylenic CH stretch (ν₁), the symmetric CH₂ stretch (ν₂), and the antisymmetric CH₂ stretch (ν₁₃) of the trans-acetylenic propargyl peroxy radical (•OO—CH₂—C≡CH). The observed band origins are in excellent agreement with previously reported anharmonic frequency computations for this species. The Stark spectrum of the ν₁ band provides further evidence that the reaction leads only to the trans-acetylenic species. There are no other bands in the CH₂ stretching region that can be attributed to any of the other three propargyl peroxy isomers/conformers that are predicted to be minimum energy structures (gauche-acetylenic, cis-allenic, and trans-allenic). There is also no evidence for the kinetic stabilization of a van der Waals complex between propargyl and O₂. A combination of multireference and coupled-cluster electronic structure calculations is used to probe the potential energy surface in the neighborhood of the transition state connecting reactants with the acetylenic adduct. The multireference based evaluation of the doublet-quartet splitting added to the coupled-cluster calculated quartet state energies yields what are likely the most accurate predictions for the doublet potential curve. As a result, this calculation suggests that there is no saddle point for the addition process, in agreement with the experimental observations. Other calculations suggest the possible presence of a small submerged barrier.

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Research Organization:: Univ. of Georgia, Athens, GA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division

Grant/Contract Number:: SC0008086

OSTI ID:: 1409049

Journal Information:: Journal of Physical Chemistry. A, Molecules, Spectroscopy, Kinetics, Environment, and General Theory, Vol. 117, Issue 50; ISSN 1089-5639

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 32 works

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References (53)

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Title: Propargyl + O₂ Reaction in Helium Droplets: Entrance Channel Barrier or Not?