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SUMMARY:Single Molecular Spectroscopy at Heterogeneous Surfaces - Scanning
  Tunneling Spectroscopy
DTSTART:20110401T140000
DTSTAMP:20260414T071549Z
UID:04ce8a0ecd9dbc6188f935a0b54141d266c82b7dcffd1fbde2bf8aa9
CATEGORIES:Conferences - Seminars
DESCRIPTION:Maki Kawai\, Executive Director\, RIKEN and Department of Adva
 nced Materials Science\, University of Tokyo\nUltimate spatial resolution 
 of scanning tunneling microscope (STM) enables us to observe the inner ele
 ctronic\, vibrational and spin structures of a molecule adsorbed on solid 
 surfaces. Vibrational spectrum of a single molecule provides useful inform
 ation not only for the chemical identification of the molecule but also fo
 r investigating how molecular vibrations can couple with the relevant dyna
 mical processes. The response of vibrationally mediated molecular motion t
 o applied bias voltage\, namely an “action spectrum”\, can reveal vibr
 ational modes that excited through STM inelastic tunneling processes\, bec
 ause the molecular motion is induced only via the inelastic tunneling proc
 esses. Thus\, the action spectrum would be a candidate for detecting which
  vibrational mode is actually excited and associated with molecular motion
 s. The mechanism to excite vibrational modes of molecules is revealed to b
 e a resonant mechanism. A theoretical analysis of the action spectrum even
  enabled us to learn about the assorted excitation relevant for the reacti
 on to occur. Life-time of the vibrational excited state was found to lengt
 hen by inserting insulator thin film of MgO\, decoupling the adsorbate and
  metal\, enabled to split water molecule by exciting the OH stretching mod
 e.
LOCATION:PH H3 31
STATUS:CONFIRMED
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