Berlin 2005 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 34: Novel materials II
CPP 34.4: Vortrag
Mittwoch, 9. März 2005, 12:00–12:15, TU C230
Elemental trace analysis in presolar meteorite dust using the nano-ESCA — •P. Bernhard1, Ch. Ziethen1, H.J. Elmers1, J. Maul1, G. Schönhense1, M. Escher2, N. Weber2, M. Merkel2, B. Krömker3, D. Funnemann3, S. Schmidt4, F. Reinert4, F. Forster4, and S. Hüfner4 — 1Johannes Gutenberg Universität, Institut für Physik, Staudinger Weg 7, 55128 Mainz — 2FOCUS GmbH, Am Birkhecker Berg 20, 65510 Hünstetten — 3OMICRON nanotechnology GmbH, 65232 Taunusstein — 4Universität des Saarlandes, FR 7.2 Experimentalphysik, 66041 Saarbrücken
Trace elements with very small concentrations have been detected in presolar meteorite dust via their local XPS spectra using the nano-ESCA instrument [1]. Small area spectra as well as energy filtered images in the binding-energy range between 0 and 750 eV have been acquired for a sample from the Murchison meteorite that consists essentially of presolar silicon carbide grains. These grains incorporate a number of minor and trace elements [2]. Our high energy (110 meV) and spatial resolution (100 nm range) allow a detailed analysis of the prominent lines of the main constituents (Si 2p and 2s, C 1s) as well as the 3d lines of transition metals and the 4d lines of several rare earth elements contained in the sample. Significant core level shifts give access to the chemical state of the trace elements. [1] M. Escher et al., J. Phys.: Cond. Matt. (2004) in print [2] P. Hoppe and U. Ott, in Astrophysical Implications of the Laboratory Study of Presolar Materials, CP402, American Institute of Physics (1997) 27 Thanks are due to U. Ott and J. Maul for the loan of the sample, financial support by BMBF (13N 7863) is gratefully acknowledged.