Regensburg 2004 – wissenschaftliches Programm

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O: Oberflächenphysik

O 18: Adsorption an Oberflächen I

O 18.2: Vortrag

Dienstag, 9. März 2004, 11:30–11:45, H38

In-situ XPS studies of CO adsorption on Pd(111) in the pressure range from 10−8 to 1 mbar — •J. Pantförder, S. Pöllmann, D. Borgmann, R. Denecke, and H.-P. Steinrück — Physikalische Chemie II, Universitaet Erlangen-Nuernberg, Egerlandstr. 3, 91058 Erlangen

In an effort to extend the usable pressure range for electron based spectroscopies from UHV into the so-called pressure gap region, we have built a new experimental setup for in-situ XPS up to 1 mbar. The principle of the high pressure cell is based on several stages of differentially pumping between sample and electron detection, similar to earlier experimental setups [1]. In our apparatus the measurements can be performed either by using an ambient pressure in the cell or by application of a directed gas beam yielding a considerably lower background pressure. The performance of the high pressure setup will be discussed by the pressure dependence of CO adsorption on Pd(111), which can be compared to SFG and XP measurements [2].

Supported by the DFG (Schwerpunktsprogramm 1091, Ste620/3-3).

[1] H.J. Ruppender et al., Surf. Interface Anal. 15 (1990) 245; R.W. Joyner et al., Surf. Sci. 87 (1979) 501.

[2] V. V. Kaichev et al., J. Phys. Chem. B 107 (2003) 3522.

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