Chaos in the multiple photon excitation of molecules due to vibrationhyphen;rotation coupling at lowest order

摘要

We study the multiple photon excitation of a molecule with a triply degenerate nearhyphen;resonant IRhyphen;active mode. The molecule is described by its zerothhyphen;order Hamiltonian as an uncoupled harmonic oscillatorhyphen;rigid rotor. The moleculehyphen;field interaction is dipolar with the field treated semiclassically. The Hiesenberg equations of motion are solved in the classical approximation and chaos is found when the photon absorption exceeds thet=0 angular momentum. The origin of the chaos is due to the nonconservation of the molecule angular momentum.