Development of semiclassical molecular dynamics simulation method

Hiroki Nakamura*, Shinkoh Nanbu, Yoshiaki Teranishi, Ayumi Ohta

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


Various quantum mechanical effects such as nonadiabatic transitions, quantum mechanical tunneling and coherence play crucial roles in a variety of chemical and biological systems. In this paper, we propose a method to incorporate tunneling effects into the molecular dynamics (MD) method, which is purely based on classical mechanics. Caustics, which define the boundary between classically allowed and forbidden regions, are detected along classical trajectories and the optimal tunneling path with minimum action is determined by starting from each appropriate caustic. The real phase associated with tunneling can also be estimated. Numerical demonstration with use of a simple collinear chemical reaction O + HCl → OH + Cl is presented in order to help the reader to well comprehend the method proposed here. Generalization to the on-the-fly ab initio version is rather straightforward. By treating the nonadiabatic transitions at conical intersections by the Zhu-Nakamura theory, new semiclassical MD methods can be developed.

Original languageEnglish
Pages (from-to)11972-11985
Number of pages14
JournalPhysical Chemistry Chemical Physics
Issue number17
StatePublished - 1 Jan 2016


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