Turn-up effects at low momentum for the highest occupied molecular orbital of oxygen at various impact energies by electron momentum spectroscopy

The unexpected higher intensity at low momentum region in (e,2e) ionization cross sections, as called turn-up effect, was observed recently. This work systemically investigated this effect for the highest occupied molecular orbital of oxygen at various impact energies of 400, 600, 800, 1200, 1800, a...

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Bibliographic Details
Published in:Physical review. A, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2006-02, Vol.73 (2), Article 022704
Main Authors: Ning, C. G., Ren, X. G., Deng, J. K., Su, G. L., Zhang, S. F., Li, G. Q.
Format: Article
Language:English
Subjects:
ATOMIC AND MOLECULAR PHYSICS
CORRELATIONS
CROSS SECTIONS
DISTORTED WAVE THEORY
ELECTRON SPECTRA
ELECTRONS
EV RANGE 100-1000
INTERACTIONS
IONIZATION
KEV RANGE 01-10
MOLECULAR ORBITAL METHOD
MOLECULES
OXYGEN
SPECTROSCOPY
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Summary:The unexpected higher intensity at low momentum region in (e,2e) ionization cross sections, as called turn-up effect, was observed recently. This work systemically investigated this effect for the highest occupied molecular orbital of oxygen at various impact energies of 400, 600, 800, 1200, 1800, and 2400 eV by electron momentum spectroscopy. This turn-up became higher as the impact energy declined, which can be qualitatively predicted by the distorted wave explanation. However, it may be also due to some other dynamic interaction, such as the dynamic correlation. Since the oxygen molecule is the simplest multicenter system with such effects, this experimental result could be a test-bed for the accurate calculation of this effect in the molecular system.
ISSN:1050-2947
1094-1622
DOI:10.1103/PhysRevA.73.022704