Positronium deuteride and hydride in MgO crystals

M. Monge; R. Pareja; R. González; Y. Chen

doi:10.1007/bf02036251

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Journal of Radioanalytical and Nuclear Chemistry

Volume/Issue:: Volume 211: Issue 1

Positronium deuteride and hydride in MgO crystals

Authors:

M. Monge

M. Monge Universidad Carlos III de Madrid Departamento de Física C/Butarque 15 28911 Leganés (Spain)

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R. Pareja

R. Pareja Universidad Carlos III de Madrid Departamento de Física C/Butarque 15 28911 Leganés (Spain)

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R. González

R. González Universidad Carlos III de Madrid Departamento de Física C/Butarque 15 28911 Leganés (Spain)

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, and

Y. Chen

Y. Chen U.S. Department of Energy ER 131, Division of Materials Sciences, Office of Basic Energy Sciences 207874-1290 Washington, D.C. (USA)

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Pages:: 23–29

Online Publication Date:: 13 Aug 2005

Publication Date:: 17 Nov 1996

Article Category:: Research Article

DOI:: https://doi.org/10.1007/bf02036251

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Abstract

Low-temperature positron lifetime and Doppler broadening measurements were made in MgO crystals containing D^– or H^– ions in order to investigate the temperature dependence of the positron trapping by D^– and H^– ions and elucidate the possible formation of PsD (PsH) states. Positrons are trapped at D^– and H^– ions once the oxygen vacancies, which are more effective positron traps, are eliminated by annealing the crystals at high temperatures in a reducing atmosphere. From the temperature dependence of the annihilation parameters the positron trapping coefficients for D^– and H^– centers were shown to increase with temperature between 100–300 K. The lifetime of the PsD (PsH) state is (650±30) ps and temperature independent. The dissociation rate of the PsD (PsH) state into D (H) and Ps is also temperature independent. No isotopic effect was observed.

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Journal of Radioanalytical and Nuclear Chemistry

Print ISSN:: 0236-5731

Online ISSN:: 1588-2780

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Journal of Radionalytical and Nuclear Chemistry
Language	English
Size	A4
Year of Foundation	1968
Volumes per Year	1
Issues per Year	12
Founder	Akadémiai Kiadó
Founder's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher	Akadémiai Kiadó Springer Nature Switzerland AG
Publisher's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible Publisher	Chief Executive Officer, Akadémiai Kiadó
ISSN	0236-5731 (Print)
ISSN	1588-2780 (Online)