Dresden 2003 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

O: Oberflächenphysik

O 9: Adsorption an Oberfl
ächen I

O 9.4: Vortrag

Montag, 24. März 2003, 15:45–16:00, FOE/ANOR

First NMR measurement from ¹²⁹Xe monolayer adsorbed on a single crystal surface — •M. Koch, P. Gerhard, D. Fick, and H.J. Jänsch — Universität Marburg, FB Physik, D-35032 Marburg

In exploring large area materials like powders, catalysts or zeolithes nuclear magnetic resonance (NMR) with ¹²⁹Xe is a very successful and often used method. ¹²⁹Xe is highly sensitive to it’s local chemical environment and shows a wide range of chemical shifts. Catalysts or powders show very wide resonance lines the origin of which is difficult to determine. Reference data are of high importance.

For the first time we show ¹²⁹Xe NMR measurements on a single crystal surface. Signals from monolayer ¹²⁹Xe adsorbed on a Ir(111) single crystal surface precovered with carbon monoxide (CO) or ethylidyne (CH₃C) are presented. Strong dependence of the chemical shift from temperature and surface orientation has been observed.

We discuss surface preparation and TPD spectra of ¹²⁹Xe adsorbed on the different substrates.

- Supported by Deutsche Forschungsgemeinschaft (DFG), Bonn. -