Annihilation of incompletely thermalized positronium studied by age-momentum correlation

Hermann Stoll, Markus Koch, Ulrich Lauff, Karl Maier, Janos Major, Hendrik Schneider, Alfred Seeger, Andreas Siegle

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

The dependence of the Doppler broadening of the 511 keV photon annihilation line of positrons annihilating in a variety of solid and liquids is studied as a function of the positron age (= time spent by the positrons in the sample between injection and annihilation) by age-momentum correlation (AMOC) measurements. At small positron ages an extra broadening of the momentum distribution of the annihilating positrondashelectron pairs is observed in all positronium-forming materials investigated (fused quartz, boron nitride, methanol, ndashhexane) but not in materials in which there is no evidence for positronium formation (Al, diamond, Al2O3). The "young-age broadening" is attributed to delayed thermalization of positronium atoms with kinetic energies of a few electron volts.

Original languageEnglish
Pages (from-to)17-21
Number of pages5
JournalApplied Surface Science
Volume85
Issue numberC
DOIs
Publication statusPublished - Jan 2 1995

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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