Microscopic simulation of quantum dynamics and nuclear tunneling in bacterial reaction centers.

The "dispersed polaron" version of the semiclassical trajectory approach is used to evaluate the quantum mechanical nuclear tunneling effects in the charge recombination reaction, P(+)Q(-)→PQ, in photosynthetic bacterial reaction centers, The cclculations are based on the crystallographic structure of reaction centers from Rhodopseudomonas viridis. They succeed in capturing the temperature dependence of the rate constant without using adjustable parameters. This provides the first example of a microscopic simulation of quantum mechanical nuclear tunneling in a biological system.