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
Abstract
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.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| ID Code: | 5145 |
| Deposited On: | 18 Oct 2010 06:13 |
| Last Modified: | 19 May 2011 10:33 |
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