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Regensburg 2000 – scientific programme

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O: Oberflächenphysik

O 11: Postersession (Eröffnung)

O 11.138: Poster

Monday, March 27, 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. Gröning21Omicron 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.

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