Positron annihilation in p-[(p-ethoxybenzylidene) amino] benzonitrile (PEBAB)

Bhide, V. G. ; Malhotra, B. D. ; Jain, P. C. (1978) Positron annihilation in p-[(p-ethoxybenzylidene) amino] benzonitrile (PEBAB) Solid State Communications, 28 (3). pp. 295-296. ISSN 0038-1098

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/003810...

Related URL: http://dx.doi.org/10.1016/0038-1098(78)90647-6


Positron life-time measurements have been made in a positive dielectric anisotropy (εα gt; 0) liquid-crystal PEBAB as a function of temperature for the first time. It is found that unlike in negative dielectric anisotropy liquid-crystalline materials, the ortho-positronium life-time, t2, increases as the order sets in: t2 (isotropic liquid) <t2 (nematic) < t2 (solid) indicating that an increase in molecular ordering in this material brings about a decrease in the pick-off cross-section.

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Deposited On:18 Oct 2010 06:13
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