Dresden 2003 – wissenschaftliches Programm

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O: Oberflächenphysik

O 30: Methodisches (Experiment und Theorie)

O 30.2: Vortrag

Donnerstag, 27. März 2003, 11:30–11:45, M\"UL/ELCH

NMR chemical shift measurements of ¹²⁹Xe on single crystal surfaces — •P. Gerhard, M. Koch, D. Fick, and H.J. Jänsch — Philipps–Universität Marburg, FB Physik, D–35032 Marburg

We show for the first time results of NMR chemical shift measurements of hyperpolarized ¹²⁹Xe on an Ir(111) single crystal surface.

Nuclear magnetic resonance (NMR) spectroscopy is one of the most popular and successful methods. In surface science the use of NMR has generally been limited to materials with large surfaces (powders, zeolithes) due to a lack of sensitivity of several orders of magnitude. Experiments on single crystal surfaces have so far only been conducted using ^6,7,8Li and unconventional, elaborate methods [1].

¹²⁹Xe provides a sensitive, inert probe and can easily be hyperpolarized. Monolayer sensitivity could be demonstrated for conventional NMR detection [2]. This enabled us to study single crystal surfaces exploiting the possibilities of surface preparation and manipulation. Beside chemical shift measurements on different surfaces [3], in situ verification of nuclear polarizations up to 0.8 and measurements of Xe films are presented. Supported by the Deutsche Forschungsgemeinschaft.

[1] H. J. Jänsch, Appl. Phys. A 65 (1997) 567

[2] D. Stahl et al., J. Magn. Reson., in press

[3] H. J. Jänsch et al., Chem. Phys. Lett., submitted