An efficient microcanonical sampling procedure for molecular systems

Abstract

A general and efficient microcanonical sampling (EMS) procedure based on that of Severin et al. [Chem. Phys. Lett. 57, 117 (1978)] is outlined. The relevant statistical weights are derived. The EMS method can be used for the generation of initial microcanonical states for trajectories or directly in the efficient calculation of microcanonical statistical averages and rate constants. The validity and usefulness of the EMS method is demonstrated in applications to 1D linear chains and 3D molecules such as H2O, SiH2, and Si2H6.