Positronium deuteride and hydride in MgO crystals
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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.
KeywordsOxygen Atmosphere Physical Chemistry Inorganic Chemistry Hydride
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- 1.V. I. GOLDANSKII, At. Energy Rev., 6 (1968) 3.Google Scholar
- 2.D. M. SCHRADER, Materials Sci. Forum, 175–178 (1995) 77.Google Scholar
- 3.R. PAREJA, R. M. DE LA CRUZ, M. A. PEDROSA, R. GONZÁLEZ, Phys. Rev., B41 (1990) 6220.Google Scholar
- 5.R. GONZÁLEZ, Y. CHEN, M. MOSTOLLER, Phys. Rev., B24 (1981) 6862.Google Scholar
- 6.Y. CHEN, R. GONZÁLEZ, O. E. SCHOW, G. P. SUMMERS, Phys. Rev., B27 (1983) 1276.Google Scholar
- 7.D. C. CLARY, J. Phys., B9 (1976) 3115.Google Scholar
- 8.Y. K. HO, Phys. Rev., A34 (1986) 609.Google Scholar
- 9.M. J. PUSKA, C. CORBEL, R. M. NIEMINEN, Phys. Rev., B41 (1990) 9980.Google Scholar