Single Molecular Spectroscopy at Heterogeneous Surfaces - Scanning Tunneling Spectroscopy
Event details
| Date | 01.04.2011 |
| Hour | 14:00 |
| Speaker | Maki Kawai, Executive Director, RIKEN and Department of Advanced Materials Science, University of Tokyo |
| Location |
PH H3 31
|
| Category | Conferences - Seminars |
Ultimate spatial resolution of scanning tunneling microscope (STM) enables us to observe the inner electronic, vibrational and spin structures of a molecule adsorbed on solid surfaces. Vibrational spectrum of a single molecule provides useful information not only for the chemical identification of the molecule but also for investigating how molecular vibrations can couple with the relevant dynamical processes. The response of vibrationally mediated molecular motion to applied bias voltage, namely an “action spectrum”, can reveal vibrational modes that excited through STM inelastic tunneling processes, because the molecular motion is induced only via the inelastic tunneling processes. Thus, the action spectrum would be a candidate for detecting which vibrational mode is actually excited and associated with molecular motions. The mechanism to excite vibrational modes of molecules is revealed to be a resonant mechanism. A theoretical analysis of the action spectrum even enabled us to learn about the assorted excitation relevant for the reaction to occur. Life-time of the vibrational excited state was found to lengthen by inserting insulator thin film of MgO, decoupling the adsorbate and metal, enabled to split water molecule by exciting the OH stretching mode.
Links
Practical information
- Informed public
- Free
Organizer
- ICMP
Contact
- Wolfgang Harbich ([email protected])