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HERO ID
7731017
Reference Type
Journal Article
Title
Gamma-ray spectra of hexane (C6H14) in positron-electron annihilation process
Author(s)
Ma, X; Wang, F
Year
2013
Is Peer Reviewed?
1
Journal
Radiation Physics and Chemistry
ISSN:
0969-806X
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Location
OXFORD
Volume
89
Page Numbers
14-19
Language
English
DOI
10.1016/j.radphyschem.2013.03.029
Web of Science Id
WOS:000320750100002
Abstract
Theoretical gamma-ray spectra of molecule hexane have been calculated and compared with the experimental results in both gas (Iwata et al., 1997a) and liquid (Kerr et al., 1965) phases. The present study reveals that in gas phase not all valence electrons of hexane contribute the same degree in the electron-positron annihilation of hexane. The electrons which dominate the positron-electron annihilation of molecules are called positrophilic electrons. The positrophilic electrons are predominately found to involve the electrons on the lowest occupied valence orbital (LOVO) of a free molecule in gas phase. When hexane is confined in liquid phase, however, the intermolecular interactions ultimately eliminate the free molecular orientation and selectivity for the positrophilic electrons in the gas phase. As a result, the gamma-ray spectra of hexane become an "averaged" contribution from all valence electrons, which is again in agreement with liquid phase measurement. The roles of valence electrons in annihilation process for gas and liquid phases of hexane have been recognized for the first time in the present study. © 2013 Elsevier Ltd.
Keywords
Gamma-ray spectra of hexane; Positron-electron annihilation; Positrophilic electrons; Lowest occupied valence orbital (LOVO)
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