Positron bound states on hydride ions in thermochemically reduced MgO single crystals

Journal Article · Tue Oct 01 04:00:00 EDT 1996 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.54.8950· OSTI ID:383834

Monge, M A; Pareja, R; Gonzalez, R ^[1]; Chen, Y ^[2]

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1. Departamento de Fisica, Universidad Carlos III de Madrid, C/Butarque 15, 28911 Leganes (Spain)
2. U.S. Department of Energy, ER 131, Division of Materials Sciences, Office of Basic Energy Sciences, Washington, D.C. 20874-1290 (United States)

Positron-lifetime and Doppler-broadening techniques were used to unambiguously identify positronium hydrides in thermochemically reduced MgO crystals at low temperatures. Positrons trapped at H{sup {minus}} ions, forming PsH, yield a lifetime of (640{plus_minus}40) ps, independent of temperature. Complementary evidence for this identification was provided by Doppler-broadening experiments, in which positrons were trapped at H{sup 2{minus}} sites at low temperatures. The H{sup 2{minus}} ions were formed via H{sup {minus}}+{ital e}{sup {minus}}{r_arrow}H{sup 2{minus}} by the capturing of an electron released from Fe{sup +} impurity under blue-light stimulation. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 383834
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 13 Vol. 54; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
DOPPLER BROADENING
HYDRIDES
LIFETIME
MAGNESIUM OXIDES
MONOCRYSTALS
POSITRONIUM COMPOUNDS
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
TRAPPING