Ma. Collins et Hw. Schranz, QUANTUM SIMULATIONS OF NONLINEAR RESONANCE AND TORSIONAL DYNAMICS, The Journal of chemical physics, 100(3), 1994, pp. 2089-2103
A simple model of the vibrational dynamics of ABBA type sequentially b
onded tetra-atomic molecules is investigated by quantum mechanical met
hods. The model Hamiltonian excludes bond stretching and asymmetric be
nding but includes the kinematic coupling between the torsional motion
and symmetric bond bending which results in nonlinear resonances. The
effect of this coupling on energy levels and the timescale of intramo
lecular energy transfer is evaluated and discussed in terms of both re
sonant and nonresonant effects.