Orientational anisotropy induced by the interaction of a laser with a permanent electric dipole: An FMD simulation

Abstract

Field applied molecular dynamics (FMD) computer simulation is used to show the presence of a novel orientational anisotropy generated by the first order interaction of a permanent molecular electric dipole moment with the electric field of a circularly polarised laser at visible (terahertz) frequencies. The anisotropy appears in orientational second order rise transients and laser-applied time correlation function components, despite the fact that the laser frequency is far higher than the characteristic reorientational frequencies of the molecule and despite the fact that Langevin-Kielich functions for this process cannot be defined.