ABINITIO CALCULATIONS OF THE GROUND-STATE POTENTIAL-ENERGY SURFACE FOR THE C-F BOND DECOMPOSITION IN NORMAL-FLUOROPROPANE WITHIN THE METHOD FOR APPROXIMATION OF THE FROZEN MOLECULAR FRAGMENT

The recently proposed ab initio method for calculation on many-electron molecular systems with the approximation of the inactive part of a molecule by a frozen molecular fragment was tested further in a case of the dissociation reaction of the C-F bond in n-fluoropropane. Results from the Hartree-Fock, multiple reference double-excitation configuration-interaction and second-order Moller-Plesset methods are presented. The reproduction of potential energy surfaces as well as the reproduction of electron density distribution are in excellent agreement with extended basis-set calculations. Different choices of fragments to be frozen have been examined.