AVS 50th International Symposium
    QSA-10 Topical Conference Monday Sessions
       Session QS-MoM

Paper QS-MoM10
Extrinsic and Intrinsic Excitations in Ge and Si Photoelectron Spectra

Monday, November 3, 2003, 11:20 am, Room 320

Session: Advances in Quantitative Surface Analysis
Presenter: L. Kövér, Institute of Nuclear Research of the Hungarian Academy of Sciences
Authors: L. Kövér, Institute of Nuclear Research of the Hungarian Academy of Sciences
Z. Berényi, Institute of Nuclear Research of the Hungarian Academy of Sciences
S. Tougaard, University of Southern Denmark
F. Yubero, Institutio de Ciencia de Materiales de Sevilla, Spain
I. Cserny, Institute of Nuclear Research of the Hungarian Academy of Sciences
J. Végh, Institute of Nuclear Research of the Hungarian Academy of Sciences
J. Tóth, Institute of Nuclear Research of the Hungarian Academy of Sciences
D. Varga, Institute of Nuclear Research of the Hungarian Academy of Sciences
W. Drube, HASYLAB at Deutsches Elektronen-Synchrotron DESY, Germany
T. Eickhoff, HASYLAB at Deutsches Elektronen-Synchrotron DESY, Germany
Correspondent: Click to Email
Studying excitations accompanying deep core photoemission and Auger transitions in solids of great practical interest is important for understanding solid state effects@footnote 1@ on such transitions and for revealing the electronic structure of these systems. Here we report our results for (Ge 1s,2s; Si 1s) core photoelectron spectra excited by X-rays of different energies. Photoelectron spectra were obtained using the Tunable High Energy XPS facility at the BW2 beamline of HASYLAB,@footnote 2@ while the electron energy loss spectra reflecting the effects due to inelastic scattering (extrinsic losses) were measured with the home built ESA-31 electron spectrometer.@footnote 3@ The background corrected spectra are compared to model spectra calculated within the frame of a theory@footnote 4@ developed to describe both extrinsic and intrinsic (due to the appearance of the core hole) losses in XPS experiments. In addition, the ratio of the probabilities of extrinsic and intrinsic plasmon creation has been derived analyzing the excited plasmon spectra and is compared to the ratio obtained from the theory and from an other experimental approach. In a reasonable agreement with the theory, our analysis of the measured spectra shows a significant contribution from intrinsic excitations. Supported by OTKA T038016 and IHP-Contract HPRI-CT-1999-00040/2001-00140 (EC). @FootnoteText@ @footnote 1@ L. Kövér, Zs. Kovács,J. Tóth, I. Cserny, D. Varga, P. Weightman and S. Thurgate, Surf. Sci., 433-435(1999)833.@footnote 2@ W. Drube, T. M. Grehk,R. Treusch and G. Materlik, J. Electron Spectrosc. Relat. Phenom.,88-91(1998)683. @footnote 3@ L. Kövér, D. Varga,I. Cserny, J. Tóth and K. Tökési, Surf. Interface Anal., 19(1992)9. @foonote 4@ A. Cohen-Simonsen, F. Yubero and S. Tougaard, Phys. Rev. B56(1997)1612.