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Electron momentum spectroscopy of atoms, molecules and solids

Abstract

Electron Momentum Spectroscopy (EMS) is the application of the (e,2 e) technique to obtain detailed information on the dynamic structure of atoms, molecules, and condensed matter. The ability of EMS to provide wavefunction mapping, in terms of the independent particle representation of a many body system in momentum space, is discussed for valence electrons. The quantitative measurement of correlation effects in both the initial and final electron states is demonstrated. Correlations can significantly change the momentum density distribution, as well as giving rise to transitions forbidden in the independent particle approximation. The case of argon is discussed in some detail since both initial state correlations (d-wave correlations) and final state correlations (mainly in the 3 s{sup -1} manifold) are present. The influence of relativistic effects in outer valence momentum densities is demonstrated for Xe and Pb. The importance of correlations in the outer valence orbitals of some molecules is discussed with particular reference to H{sub 2}O. The first (e,2 e) results on an excited target and also an oriented target are discussed, as are some recent high resolution measurements on amorphous carbon. 35 refs., 12 figs.
Authors:
Publication Date:
Jan 01, 1992
Product Type:
Technical Report
Report Number:
ESM-38
Reference Number:
SCA: 664200; PA: AIX-24:003976; SN: 93000914014
Resource Relation:
Other Information: PBD: Jan 1992
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; ELECTRON SPECTROSCOPY; ORBITAL ANGULAR MOMENTUM; ARGON; ATOMS; ELECTRON REACTIONS; ELECTRON-ATOM COLLISIONS; ELECTRONIC STRUCTURE; EXCITED STATES; EXPERIMENTAL DATA; GRAPHITE; HYDROGEN; LEAD; MOLECULES; WATER; WAVE FUNCTIONS; XENON; 664200; SPECTRA OF ATOMS AND MOLECULES AND THEIR INTERACTIONS WITH PHOTONS
OSTI ID:
10109231
Research Organizations:
Flinders Univ. of South Australia, Adelaide, SA (Australia). Electronic Structure of Materials Centre
Country of Origin:
Australia
Language:
English
Other Identifying Numbers:
Other: ON: DE93610148; TRN: AU9212895003976
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
INIS
Size:
[16] p.
Announcement Date:
Jun 30, 2005

Citation Formats

Weigold, E. Electron momentum spectroscopy of atoms, molecules and solids. Australia: N. p., 1992. Web.
Weigold, E. Electron momentum spectroscopy of atoms, molecules and solids. Australia.
Weigold, E. 1992. "Electron momentum spectroscopy of atoms, molecules and solids." Australia.
@misc{etde_10109231,
title = {Electron momentum spectroscopy of atoms, molecules and solids}
author = {Weigold, E}
abstractNote = {Electron Momentum Spectroscopy (EMS) is the application of the (e,2 e) technique to obtain detailed information on the dynamic structure of atoms, molecules, and condensed matter. The ability of EMS to provide wavefunction mapping, in terms of the independent particle representation of a many body system in momentum space, is discussed for valence electrons. The quantitative measurement of correlation effects in both the initial and final electron states is demonstrated. Correlations can significantly change the momentum density distribution, as well as giving rise to transitions forbidden in the independent particle approximation. The case of argon is discussed in some detail since both initial state correlations (d-wave correlations) and final state correlations (mainly in the 3 s{sup -1} manifold) are present. The influence of relativistic effects in outer valence momentum densities is demonstrated for Xe and Pb. The importance of correlations in the outer valence orbitals of some molecules is discussed with particular reference to H{sub 2}O. The first (e,2 e) results on an excited target and also an oriented target are discussed, as are some recent high resolution measurements on amorphous carbon. 35 refs., 12 figs.}
place = {Australia}
year = {1992}
month = {Jan}
}