Ab initio calculation of the anharmonic force and dipole fields of nitrogen trifluoride

The anharmonic force and electric dipole fields of nitrogen trifluoride were obtained from ab initio computations using the second-order Mّller-Plesset (MP2) level of theory for the harmonic part of the force field and dipole first derivatives and Hartree-Fock self-consistent field (HF-SCF) for higher order derivatives. Following a previously proposed procedure, the theoretical computations are further improved by fitting a small number of scaling parameters to a selected set of experimental observables.