A global 12-dimensional ab initio potential energy surface and dynamical studies for the SiH4+H→SiH3+H2 reaction

A global 12-dimensional ab initio interpolated potential energy surface (PES) for the SiH4+H -> SiH3+H-2 reaction is presented. The ab initio calculations are based on the unrestricted quadratic configuration interaction treatment with all single and double excitations together with the cc-pVTZ basis set, and the modified Shepard interpolation method of Collins and co-workers [K. C. Thompson , J. Chem. Phys. 108, 8302 (1998); M. A. Collins, Theor. Chem. Acc. 108, 313 (2002); R. P. A. Bettens and M. A. Collins, J. Chem. Phys. 111, 816 (1999)] is applied. Using this PES, classical trajectory and variational transition state theory calculations have been carried out, and the computed rate constants are in good agreement with the available experimental data. (c) 2006 American Institute of Physics.