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

Journal Article · Mon Sep 28 00:00:00 EDT 1998 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.56561· OSTI ID:21202602

Kukk, E ^[1]; Wills, A A; Berrah, N ^[1]; Langer, B ^[2]; Bozek, J D ^[3]

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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)

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.

• OSTI ID: 21202602
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 443; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

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