An analysis of nonadiabatic ring-polymer molecular dynamics and its application to vibronic spectra

作者：Richardson Jeremy O^*; Meyer Philipp; Pleinert Marc Oliver; Thoss Michael

来源：Chemical Physics, 2017, 482: 124-134.

DOI：10.1016/j.chemphys.2016.09.036

• Vibronic spectra
• Ring-polymer molecular dynamics
• Nonadiabatic
• Mapping approach

Nonadiabatic ring-polymer molecular dynamics employs the mapping approach to describe nonadiabatic effects within the ring-polymer ansatz. In this paper, it is generalized to allow for the nuclear and electronic degrees of freedom to be described by different numbers of ring-polymer beads. Analysis of the resulting method shows that as the number of electronic mapping variables increases, certain problems associated with the approach are removed, such as the non-unique choice of the mapping Hamiltonian and negative populations leading to inverted potential-energy surfaces. Explicit integration over cyclic variables reduces the sign problem for the initial distribution in the general case. A new application for the simulation of vibronic spectra is described and promising results are presented for a model system.

• 出版日期2017-1-12