title: Mode-selective promotion and isotope effects of concerted double-hydrogen tunneling in porphycene embedded in superfluid helium nanodroplets.
abstract: Intramolecular double-hydrogen tunneling in porphycene (see picture) is investigated. Low-temperature conditions are ensured by doping of single molecules into superfluid helium nanodroplets. The investigation of fluorescence excitation and dispersed emission spectra and the highly dissipative environment allows the observation of mode-selective tunneling splitting and reveals a purely concerted tunneling mechanism for all isotopic variants of porphycene.
authors.affiliation: Institut für Physikalische und Theoretische Chemie, Universität Regensburg, Universitätsstrasse 31, 93053 Regensburg, Germany.
authors.forename: Alexander
authors.initials: A
authors.lastname: Vdovin
authors.forename: Jacek
authors.initials: J
authors.lastname: Waluk
authors.forename: Bernhard
authors.initials: B
authors.lastname: Dick
authors.forename: Alkwin
authors.initials: A
authors.lastname: Slenczka