Dresden 2006 – scientific programme
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O: Oberflächenphysik
O 12: Methods
O 12.8: Talk
Monday, March 27, 2006, 16:45–17:00, WIL B321
An Energy Dispersive beamline for NEXAFS and other CFS/CIS studies — •D. R. Batchelor1, Th. Schmidt 1, R. Follath 2, Ch. Jung 2, R. Fink 3, M. Knupfer 4, A. Schöll 1, and E. Umbach 1 — 1Exp.Physik II, Univ. Würzburg — 2BESSY Gmbh — 3Phys. Chem. II, Univ. Erlangen — 4IFW Dresden
Energy dispersive NEXAFS is a quite well known technique in the Hard X-Ray region . It is however not so well known in the Soft X-Ray region [1]. By combining the energy dispersion of a monochromator and the imaging properties of a hemispherical electron analyser the simultaneous detection of electron distribution curves as a function of photon energy is possible. The dispersion of the monochromator is projected on to the sample and subsequently imaged in the non dispersive plane of the analyser. Such an instrument is able to fully exploit the small spot size of state-of-art synchrotron monochromators and modern electron energy analysers with 2D imaging detectors. The parallel detection enables a large parameter space to be efficiently sampled such that, e.g., high energy resolution can be combined with short time scales in the ms range. We present the design for an upgrade of an existing beamline and a pilot experiment utilising the low angular divergence of a PGM which is operated at low Cff values. The advantages and need for such an experimental setup will be illustrated using traditional CFS/CIS data of organic thin films.
Funded by BMBF under contract no. 05KS4WWC/2
[1] K. Amemiya, H. Kondoh, T. Yokoyama, T. Ohta, Journal of Electron Spectroscopy and Related Phenomena 124 (2002) 151−164