Regensburg 2000 – wissenschaftliches Programm
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O: Oberflächenphysik
O 11: Postersession (Eröffnung)
O 11.138: Poster
Montag, 27. März 2000, 19:00–22:00, Bereich C
Experimental determination of the transmission factor for the Omicron EA 125 electron energy analyser — •J. Westermann1, D. Funnemann1, Q.C. Herd1, P. Ruffieux2, P. Schwaller2, O. Gröning2, L. Schlapbach2, and P. Gröning2 — 1Omicron Vakuumphysik GmbH, D-65232 Taunusstein, Germany — 2Institut de Physique, Universite de Fribourg, Perolles, CH-1700 Fribourg, Switzerland
We present a study of the transmission factor of the Omicron
EA 125 hemispherical energy analyser with Universal Lens. The
procedure is based on a model by Cross and Castle (J. Electron
Spectrosc. Relat. Phenom. 22, (1981) 53) and is applicable to
every spectrometer which can be operated in the Constant
Analyzer Energy (CAE) and in the Constant Retard Ratio (CRR)
measuring mode. The advantage of this method is its independence
on the sample and on the inelastic mean free path of the
electrons. We find that the transmission factor for the CAE-mode
is proportional to Ekin-1 for most measurement setups in the XPS
region. This dependence is predicted by theory for an ideal
analyser. Deviations from this ideal transmission behaviour will
be discussed.