Berlin 2005 – scientific programme

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O: Oberflächenphysik

O 28: Methodisches (Exp. und Theorie)

O 28.2: Talk

Saturday, March 5, 2005, 15:15–15:30, TU EB407

Calculations for a matched photon and photoelectron energy dispersive soft x-ray beamline — •D.R. Batchelor¹, Th. Schmidt¹, R. Follath², C. Jung², R. Fink³, and E. Umbach¹ — ¹EP2, Univ. Würzburg — ²BESSY Gmbh — ³Phys.Chem. II, Univ. Erlangen

The high brilliance of third generation synchrotron radiation sources and modern developments in monochromator design, combined with 2d- detecting electron energy analysers, allow the simultaneous detection of photoelectron and photon energy: the photon dispersion of the monochromator is imaged onto the specimen, and the 1d-laterally resolving analyser is used to detect this dispersion. Such a combination opens up exploitation of CFS and CIS techniques such as NEXAFS, resonant Auger, and photoelectron spectroscopy. The parallel detection enables the large parameter space to be efficiently sampled such that high energy resolution can be combined with short time scales in the ms range. However, the electron and photon optics of monochromator and electron energy analyser have to be matched and optimised, considering imaging and dispersion characteristics of both. We present calculations for the combination of a collimated, variable cff, PGM monochromator and a Scienta SES 200 analyser with a 2d-detector at the UE52 Undulator at BESSY II, evaluating the limitations and developments necessary to realise the full potential of such an experiment.

Funded by BMBF under contract no. 05KS4WWC/2