We consider the general problem of vibrational analysis at nonglobally optimized points on a reduced dimensional reaction surface. We discuss the importance of the use of curvilinear internal coordinates to describe molecular motion and derive a curvilinear projection operator to remove the contribution of nonzero gradients from the Hessian matrix. Our projection scheme is tested in the context of a two-dimensional quantum scattering calculation for the reaction and its reverse . Using zero-point energies calculated via rectilinear and curvilinear projections we construct two two-dimensional, adiabatically corrected, ab initio reaction surfaces for this system. It is shown that the use of curvilinear coordinates removes unphysical imaginary frequencies observed with rectilinear projection and leads to significantly improved thermal rate constants for both the forward and reverse reactions.
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14 January 2009
Research Article|
January 13 2009
Chemical reaction surface vibrational frequencies evaluated in curvilinear internal coordinates: Application to
Simon T. Banks;
Simon T. Banks
a)
Department of Chemistry,
University of Oxford
, PTCL, South Parks Road, Oxford OX1 3QZ, United Kingdom
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David C. Clary
David C. Clary
Department of Chemistry,
University of Oxford
, PTCL, South Parks Road, Oxford OX1 3QZ, United Kingdom
Search for other works by this author on:
a)
Electronic mail: simon.banks@chem.ox.ac.uk.
J. Chem. Phys. 130, 024106 (2009)
Article history
Received:
October 17 2008
Accepted:
November 28 2008
Citation
Simon T. Banks, David C. Clary; Chemical reaction surface vibrational frequencies evaluated in curvilinear internal coordinates: Application to . J. Chem. Phys. 14 January 2009; 130 (2): 024106. https://doi.org/10.1063/1.3052076
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