Anharmonic force field and vibrational frequencies of tetrafluoromethane (CF${}_4$) and tetrafluorosilane (SiF${}_4$)

Xiao-Gang Wang, Edwin L. Sibert, Jan M. L. Martin

Accurate quartic anharmonic force fields for CF${}_4$ and SiF${}_4$ have been calculated using the CCSD(T) method and basis sets of $spdf$ quality. Based on the {\it ab initio} force f…