Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 35: Poster Session I (Scanning probe methods)
O 35.13: Poster
Dienstag, 15. März 2011, 18:30–22:00, P3
Local surface spectroscopy with STHM junction — •Georgy Kichin, Christian Weiss, Christian Wagner, Stefan Tautz, and Ruslan Temirov — Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich and JARA-Fundamentals of Future Information Technology
Scanning tunneling hydrogen microscopy (STHM) is a new imaging regime in which a low temperature (5-10K) STM can be operated when H2(D2) is adsorbed in the junction [1]. The imaging mechanism of the STHM has recently been identified: H2 or D2 confined between the tip and the surface plays a dual role of the sensor and transducer. The sensor samples interaction with the surface and translates this interaction into variations of the Pauli repulsion between the gas molecules and the tip. The transducer converts the changing Pauli repulsion into variations of the tip’s density of states (DOS), which is finally recorded as laterally varying junction conductance [2,3]. In this contribution we study inelastic electron tunneling spectra of the STHM junction. The inelastic tunneling data suggest that the junction has a rich excitation spectrum. Moreover, characteristic energies of the observed excitations show a strong dependence on such parameters as the gas coverage, tip-surface distance and the local surface structure.
[1] R. Temirov et al. New J. Phys. 2008, 10, 053012 [2] C. Weiss et al. Phys. Rev. Lett. 2010, 105, 086103 [3] C. Weiss et al. J. Am. Chem. Soc. 2010, 132, 11865