Free Access
Issue
Microsc. Microanal. Microstruct.
Volume 2, Number 2-3, April / June 1991
Page(s) 377 - 386
DOI https://doi.org/10.1051/mmm:0199100202-3037700
Microsc. Microanal. Microstruct. 2, 377-386 (1991)
DOI: 10.1051/mmm:0199100202-3037700

Electron energy and momentum spectroscopy in solids

Kaare J. Nygaard, Yu Chen, Julian Lower, Peter Storer et Erich Weigold

Electronic Structure of Materials Centre, The Flinders University of South Australia, Bedford Park, S.A. 5042, Australia


Abstract
We have used (e,2e) coincidence techniques to study electron momentum densities as a function of binding energy and momentum in thin films. The experiment employs symmetric coplanar geometry with incident electron beam energy of 10 keV. The outgoing electrons are retarded to about 100 eV before being dispersed in identical hemispherical analysers and counted in one-dimensional position-sensitive detectors consisting of multichannel plates and resistive anodes. Binding energy spectra are obtained by stepping the incident energy through a predetermined range. In amorphous carbon films 80 A thick, we have obtained electron momentum distributions for binding energies from 0 to 40 eV with momentum as parameter (0, 0.4 and 0.8 atomic units). The results clearly show contributions from the π- and σ- bands and demonstrate the usefulness of the method.

PACS
7120 - Electron density of states and band structure of crystalline solids.
7123C - Amorphous semiconductors, metallic glasses, glasses.
7920H - Electron impact: secondary emission.

Key words
e-2e spectroscopy -- Binding energy -- Momentum -- Thin films -- Carbon


© EDP Sciences 1991