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A positron study of pure and of L-alanine doped triglycine sulfate

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Serna Galán, Julio (1992) A positron study of pure and of L-alanine doped triglycine sulfate. Ferroelectrics, 129 (01). pp. 157-163. ISSN 0015-0193

Official URL: http://dx.doi.org/10.1080/00150199208016986


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Abstract

Positron lifetime spectra in TGS and in LA-TGS obtained between O-degrees-C and 75-degrees-C, can be analyzed in two components with lifetimes of about 230 ps, with an intensity of 80%, and 500 ps. The rather large uncertainties found for these values at temperatures higher than 15-degrees-C may have their origin in thermally stimulated electron emission from the crystals, making the system unstable in such a way that the ferroelectric transition is not observed. The short lifetime, which is sensitive to the concentration of L-alanine in the samples, is to be associated to the annihilation from a relatively free positron state, whereas the long-lived component is attributable to the annihilation of positrons from a not well known bound state which may be quasi-positronium.


Item Type:Article
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© 1992 Gordon and Breach Science Publishers S. A.

Uncontrolled Keywords:Thermally Stimulated Electron, Latgs Crystals, Emission, Coefficient, Lifetime
Subjects:Sciences > Physics > Optics
ID Code:22178
Deposited On:02 Jul 2013 09:23
Last Modified:02 Jul 2013 09:23

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