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Ab initio molecular dynamics on the electronic Boltzmann equilibrium distribution

AuthorsAlonso, José Luis; Castro, Alberto; Echenique, Pablo ; Polo, Víctor; Rubio, Angel; Zueco, David
Statistical mechanics
Effective potential
Issue Date2010
PublisherInstitute of Physics Publishing
CitationNew Journal of Physics 12(8): 083064 (2010)
AbstractWe prove that for a combined system of classical and quantum particles, it is possible to write a dynamics for the classical particles that incorporates in a natural way the Boltzmann equilibrium population for the quantum subsystem. In addition, these molecular dynamics do not need to assume that the electrons immediately follow the nuclear motion (in contrast to any adiabatic approach), and do not present problems in the presence of crossing points between different potential energy surfaces (conical intersections or spin-crossings). A practical application of this molecular dynamics to study the effect of temperature in molecular systems presenting (nearly) degenerate states – such as the avoided crossing in the ring-closure process of ozone – is presented.
Publisher version (URL)http://dx.doi.org/10.1088/1367-2630/12/8/083064
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