Abstract
This paper presents the first application of a new method for multidimensional real time quantum dynamics described in a previous Letter [Chem. Phys. Lett. 193, 435 (1992)]. The key feature of the method is the use of an improved zeroth order representation in the Feynman propagator, which allows large time steps in the path integral. Use of the adiabatic approximation in the case of a system coupled to a harmonic bath leads to a path integral over the system coordinate with a one-dimensional propagator which is constructed numerically and which corresponds to dynamics along the adiabatic path, and with a nonlocal influence functional that accounts for nonadiabatic effects. We have performed accurate quantum mechanical calculations on the dynamics of CH overtone relaxation in linear hydrocarbon chains by direct numerical evaluation of the path integral in the quasiadiabatic representation. Converged results for the survival probability of the υ=5 and υ=8 states of HC6 are reported up to five vibrational periods of the CH stretch and compared to those obtained from standard classical and semiclassical simulations.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
