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

Conference · Thu Sep 02 04:00:00 EDT 2004

OSTI ID:838948

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

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1. LBNL Library

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.

• Research Organization: Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
• Sponsoring Organization: USDOE Director. Office of Science. Office of Basic Energy Sciences. Division of Chemical Sciences (US)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 838948
• Report Number(s): LBNL--43476
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
74 ATOMIC AND MOLECULAR PHYSICS
ANGULAR DISTRIBUTION
ATOMS
DECAY
ELECTRON EMISSION
ELECTRON SPECTROSCOPY TIME-OF-FLIGHT POST-COLLISION-INTERACTION
ELECTRONS
ENERGY RANGE
EXCITATION
EXCITED STATES
IONIZATION
LIGHT SOURCES
NEON
PARITY
PHOTONS
SYNCHROTRONS
VALENCE