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Nonadiabatic effects in C–Br bond scission in the photodissociation of bromoacetyl chloride

J. Chem. Phys. 125, 194305 (2006); doi:10.1063/1.2363991

Published 16 November 2006

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Rosendo Valero and Donald G. Truhlar
Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455 and Supercomputing Institute, University of Minnesota, Minneapolis, Minnesota 55455
Bromoacetyl chloride photodissociation has been interpreted as a paradigmatic example of a process in which nonadiabatic effects play a major role. In molecular beam experiments by Butler and co-workers [J. Chem. Phys. 95, 3848 (1991); J. Chem. Phys. 97, 355 (1992)], BrCH2C(O)Cl was prepared in its ground electronic state (S0) and excited with a laser at 248  nm to its first excited singlet state (S1). The two main ensuing photoreactions are the ruptures of the C–Cl bond and of the C–Br bond. A nonadiabatic model was proposed in which the C–Br scission is strongly suppressed due to nonadiabatic recrossing at the barrier formed by the avoided crossing between the S1 and S2 states. Recent reduced-dimensional dynamical studies lend support to this model. However, another interpretation that has been given for the experimental results is that the reduced probability of C–Br scission is a consequence of incomplete intramolecular energy redistribution. To provide further insight into this problem, we have studied the energetically lowest six singlet electronic states of bromoacetyl chloride by using an ab initio multiconfigurational perturbative electronic structure method. Stationary points (minima and saddle points) and minimum energy paths have been characterized on the S0 and S1 potential energy surfaces. The fourfold way diabatization method has been applied to transform five adiabatic excited electronic states to a diabatic representation. The diabatic potential energy matrix of the first five excited singlet states has been constructed along several cuts of the potential energy hypersurfaces. The thermochemistry of the photodissociation reactions and a comparison with experimental translational energy distributions strongly suggest that nonadiabatic effects dominate the C–Br scission, but that the reaction proceeds along the energetically allowed diabatic pathway to excited-state products instead of being nonadiabatically suppressed. This conclusion is also supported by the low values of the diabatic couplings on the C–Br scission reaction path. The methodology established in the present study will be used for the construction of global potential energy surfaces suitable for multidimensional dynamics simulations to test these preliminary interpretations. ©2006 American Institute of Physics
History: Received 7 August 2006; accepted 22 September 2006; published 16 November 2006
Permalink: http://link.aip.org/link/?JCPSA6/125/194305/1
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KEYWORDS and PACS

Keywords
PACS
  • 82.50.Hp
    Chemical processes caused by visible and UV light
  • 82.20.Db
    Transition state theory and statistical theories of rate constants (chemical kinetics)
  • 82.20.Hf
    Product distribution in chemical kinetics
  • 82.20.Kh
    Potential energy surfaces for chemical reactions
  • 82.60.-s
    Chemical thermodynamics
  • YEAR: 2006

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