title: Electron-proton correlation for hydrogen tunneling systems.
abstract: Hydrogen tunneling is important for numerous chemical and biological processes. We study this phenomenon with a multiconfigurational nuclear-electronic orbital approach. Our results demonstrate that a single configuration nuclear-electronic wave function is inadequate to describe hydrogen tunneling systems because such wave functions do not include the essential electron-proton correlation. A state-averaged multiconfigurational approach is proposed as a practical method for potentially including sufficient electron-proton correlation to obtain delocalized nuclear-electronic wave functions for these systems.
authors.affiliation: Department of Chemistry, 152 Davey Laboratory, Pennsylvania State University, University Park, Pennsylvania 16802, USA.
authors.forename: Michael V
authors.initials: MV
authors.lastname: Pak
authors.forename: Sharon
authors.initials: S
authors.lastname: Hammes-Schiffer