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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 emissions in the HCL molecule have been mapped over a 14 eV wide photon energy range over the Cl 2p ionization threshold. 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 occurs via inter-electron correlations, the many body dynamics of an atom can be probed, revealing relativistic effects, surprising in such a light atom. Angular distribution of the decay of the resonances to the parity unfavored continuum exhibits significant deviation from the LS coupling predictions.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Director. Office of Science. Office of Basic Energy Sciences. Division of Chemical Sciences (US)
OSTI Identifier:
838948
Report Number(s):
LBNL-43476
R&D Project: 458112; TRN: US0501560
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Conference
Resource Relation:
Conference: ATOMIC PROCESSES IN PLASMAS, Auburn, AL (US), 03/1998; Other Information: PBD: 2 Sep 2004
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 74 ATOMIC AND MOLECULAR PHYSICS; ANGULAR DISTRIBUTION; ATOMS; DECAY; ELECTRON EMISSION; ELECTRONS; ENERGY RANGE; EXCITATION; EXCITED STATES; IONIZATION; LIGHT SOURCES; NEON; PARITY; PHOTONS; SYNCHROTRONS; VALENCE; ELECTRON SPECTROSCOPY TIME-OF-FLIGHT POST-COLLISION-INTERACTION

Citation Formats

Kukk, E, Wills, A A, Langer, B, Bozek, J D, and Berrah, N. Angle-resolved 2D imaging of electron emission processes in atoms and molecules. United States: N. p., 2004. Web.
Kukk, E, Wills, A A, Langer, B, Bozek, J D, & Berrah, N. Angle-resolved 2D imaging of electron emission processes in atoms and molecules. United States.
Kukk, E, Wills, A A, Langer, B, Bozek, J D, and Berrah, N. 2004. "Angle-resolved 2D imaging of electron emission processes in atoms and molecules". United States. https://www.osti.gov/servlets/purl/838948.
@article{osti_838948,
title = {Angle-resolved 2D imaging of electron emission processes in atoms and molecules},
author = {Kukk, E and Wills, A A and Langer, B and Bozek, J D and Berrah, N},
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 emissions in the HCL molecule have been mapped over a 14 eV wide photon energy range over the Cl 2p ionization threshold. 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 occurs via inter-electron correlations, the many body dynamics of an atom can be probed, revealing relativistic effects, surprising in such a light atom. Angular distribution of the decay of the resonances to the parity unfavored continuum exhibits significant deviation from the LS coupling predictions.},
doi = {},
url = {https://www.osti.gov/biblio/838948}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2004},
month = {9}
}

Conference:
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