A quantal description of the response of an extended molecular system to external probes is developed in terms of collision time-correlation functions. The system is partitioned into a primary region, where localized excitations occur, and a secondary region surrounding it. A time-dependent self-consistent field procedure is followed to derive coupled quantal equations for the transition amplitudes in both regions, and a general model is introduced for cases where the secondary region undergoes harmonic motions. A numerical procedure based on path integrals, obtained for complex times by a sequence of matrix multiplications, is illustrated with calculations of cross sections for photodissociation of CH3 I. © 1990.
Micha, D. A., & Srivastava, D. (1990). The calculation of time-correlation functions for extended molecular systems. Computers and Chemistry, 14(4), 329–334. https://doi.org/10.1016/0097-8485(90)80040-9