skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Angle-resolved 2D imaging of electron emission processes in atoms and molecules

Abstract

A variety of electron emission processes have been studied in detail for both atomic and molecular systems, using a highly efficient experimental system comprising two time-of-flight (TOF) rotatable electron energy analyzers and a 3rd generation synchrotron light source. Two examples are used here to illustrate the obtained results. Firstly, electron emission in the HCl molecule have been mapped over a 14 eV wide photon energy range over the Cl 2p ionization thresholds. Particular attention is paid to the dissociative core-excited states, for which the Auger electron emission shows photon energy dependent features. Also, the evolution of resonant Auger to the normal Auger decay distorted by post collision interaction has been observed and the resonating behavior of the valence photoelectron lines studied. Secondly, an atomic system, neon, in which excitation of doubly excited states and their subsequent decay to various accessible ionic states has been studied. Since these processes only occur via inter-electron correlations, the many-body dynamics of an atom can be probed. Electron angular distributions following the decay of certain resonances to a parity-unfavored continuum exhibits significant deviation from LS coupling predictions, which is surprising for such a light atom.

Authors:
 [1]; ;  [1];  [2];  [3]
  1. Department of Physics, Western Michigan University, Kalamazoo, Michigan 49008-5151 (United States)
  2. Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195, Berlin (Germany)
  3. Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720 (United States)
Publication Date:
OSTI Identifier:
21202602
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 443; Journal Issue: 1; Conference: International conference on atomic processes in plasmas, Auburn, AL (United States), 23-26 Mar 1998; Other Information: DOI: 10.1063/1.56561; (c) 1998 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; ANGULAR DISTRIBUTION; ATOMS; ELECTRON CORRELATION; ELECTRON EMISSION; ELECTRONS; EV RANGE; EXCITATION; EXCITED STATES; HYDROCHLORIC ACID; L-S COUPLING; MANY-BODY PROBLEM; MOLECULES; NEON; PARITY; PHOTOIONIZATION; PHOTON-ATOM COLLISIONS; PHOTON-MOLECULE COLLISIONS; TIME-OF-FLIGHT METHOD

Citation Formats

Kukk, E, Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720, Wills, A A, Berrah, N, Langer, B, and Bozek, J D. Angle-resolved 2D imaging of electron emission processes in atoms and molecules. United States: N. p., 1998. Web. doi:10.1063/1.56561.
Kukk, E, Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720, Wills, A A, Berrah, N, Langer, B, & Bozek, J D. Angle-resolved 2D imaging of electron emission processes in atoms and molecules. United States. https://doi.org/10.1063/1.56561
Kukk, E, Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720, Wills, A A, Berrah, N, Langer, B, and Bozek, J D. 1998. "Angle-resolved 2D imaging of electron emission processes in atoms and molecules". United States. https://doi.org/10.1063/1.56561.
@article{osti_21202602,
title = {Angle-resolved 2D imaging of electron emission processes in atoms and molecules},
author = {Kukk, E and Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720 and Wills, A A and Berrah, N and Langer, B and Bozek, J D},
abstractNote = {A variety of electron emission processes have been studied in detail for both atomic and molecular systems, using a highly efficient experimental system comprising two time-of-flight (TOF) rotatable electron energy analyzers and a 3rd generation synchrotron light source. Two examples are used here to illustrate the obtained results. Firstly, electron emission in the HCl molecule have been mapped over a 14 eV wide photon energy range over the Cl 2p ionization thresholds. Particular attention is paid to the dissociative core-excited states, for which the Auger electron emission shows photon energy dependent features. Also, the evolution of resonant Auger to the normal Auger decay distorted by post collision interaction has been observed and the resonating behavior of the valence photoelectron lines studied. Secondly, an atomic system, neon, in which excitation of doubly excited states and their subsequent decay to various accessible ionic states has been studied. Since these processes only occur via inter-electron correlations, the many-body dynamics of an atom can be probed. Electron angular distributions following the decay of certain resonances to a parity-unfavored continuum exhibits significant deviation from LS coupling predictions, which is surprising for such a light atom.},
doi = {10.1063/1.56561},
url = {https://www.osti.gov/biblio/21202602}, journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 443,
place = {United States},
year = {1998},
month = {9}
}