Regensburg 2002 – wissenschaftliches Programm

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O: Oberflächenphysik

O 30: Methodisches (Experiment und Theorie)

O 30.4: Vortrag

Donnerstag, 14. März 2002, 12:00–12:15, H44

Transferring classical UHV techniques into ambient pressure - is the gap bridged for electrons? — •A. Vollmer1, J.R. Lee1, G.E. Derbyshire2, J.D. Lipp2, R. Stephenson2, S.L.M. Schroeder3, H. Weiss4, and T. Rayment11Dept. of Chemistry, Univ. of Cambridge, Cambridge, UK — 2Rutherford Appleton Labs, Didcot, UK — 3Institut f. Chemie, FU Berlin — 4Chem.Inst, Uni Magdeburg

Over the last decades surface science became an invaluable tool for describing and understanding surface structures, properties and reactions, however it has been mainly restricted to model systems under ideal conditions, most prominently single crystals in ultra high vacuum (UHV). Nonetheless there has always been strong interest in heterogenous catalysis despite the difficulties to fully describe real processes in surface science terms. This fact has lead to the definition of gaps (pressure, material) between surface science and catalysis. Under UHV conditions gas-surface interaction is widely studied by means of electron detection (LEED, AES, XPS, EXAFS and many more) while in gaseous environments electrons are strongly scattered and quickly lost. Furthermore, until recently [1] energy selective electron detection at ambient pressure has not been feasible. We would like to present novel techniques, which enable us to bridge the pressure gap between surface science and real world. We report upon the development of gas microstrip detectors (GMSD) used in energy selective electron detection under reaction conditions and depth profiling, and upon a scanning x-ray microprobe as well as first steps into an ambient pressure electron gun.

[1] T. Rayment at al, Rev. Sci. Instrum. 71 (2000) 3640.

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