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Mode‐Selective Promotion and Isotope Effects of Concerted Double‐Hydrogen Tunneling in Porphycene Embedded in Superfluid Helium Nanodroplets
Author(s) -
Vdovin Alexander,
Waluk Jacek,
Dick Bernhard,
Slenczka Alkwin
Publication year - 2009
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.200900022
Subject(s) - quantum tunnelling , chemistry , hydrogen , kinetic isotope effect , photochemistry , molecule , superfluid helium 4 , hydrogen atom , intramolecular force , chemical physics , doping , superfluidity , scanning tunneling microscope , helium , atomic physics , materials science , nanotechnology , condensed matter physics , physics , stereochemistry , deuterium , organic chemistry , alkyl
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.