Positronium deuteride and hydride in MgO crystals

被引：1

作者：

Monge, MA ^{[1
]}

Pareja, R ^{[1
]}

Gonzalez, R ^{[1
]}

Chen, Y ^{[1
]}

机构：

[1] US DEPT ENERGY,DIV MAT SCI,OFF BAS ENERGY SCI,WASHINGTON,DC 20585

来源：

JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY-ARTICLES | 1996年 / 211卷 / 01期

关键词：

D O I：

10.1007/BF02036251

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

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, am 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.

引用

页码：23 / 29

页数：7