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M: Metallphysik
M 22: Elektronische Strukturen und Eigenschaften II
M 22.1: Vortrag
Freitag, 21. März 1997, 09:30–09:50, S 6
3D-electron momentum density of graphite by coincident Compton spectroscopy — •T. Sattler1, F.F. Kurp1, H. Schulte-Schrepping1, J.R. Schneider1, and F. Bell2 — 1HASYLAB am DESY, Notkestr. 85, D-22603 Hamburg — 2Sektion Physik, Universität München, Am Coulombwall 1, D-85748 Garching
The complete 3D-electron momentum density (EMD) of graphite has been
measured in a so-called (γ, eγ) experiment, i.e. by
conicident detection of an inelastically scattered hard X-ray photon and
its recoil electron. The experiment has been performed on thin
(∼4 µg/cm2) self-supporting carbon foils using 180 keV
synchrotron radiation from the undulator at the PETRA storage ring at
DESY. The coincident count rate has been increased by a factor of
∼ 6 against earlier measurements [1]. Thus, statistics have been
improved. The foils studied were produced by laser plasma
ablation-deposition and by evaporation-condensation. A comparison of both
experimental EMD’s is made. In addition, the experimental data are compared
with a theoretical EMD of graphite obtained from a pseudopotential
calculation [2].
[1] F.F. Kurp, Th. Tschentscher, H. Schulte-Schrepping, J.R. Schneider, F. Bell, Europhys. Lett. 35 (1), 61 (1996)
[2] Lou Yongming, B. Johansson, R.M. Nieminen, J. Phys.: Condens. Matter 3, 1699 (1991)