Formation of positronium in condensed matter studied by means of doppler broadening experiments with spin-polarized positrons

Th Gessmann, P. Harmat, J. Major, A. Seeger

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

By means of the so-called e+SR (positron spin relaxation) technique, spin-polarized positrons from radioactive sources emitting relativistic e+ permit to investigate the formation and the properties of positronium (Ps) in condensed matter. This is demonstrated on teflon and crystalline quartz in a facility utilizing a 68Ge/68Ga source and measuring the effect of the reversal of a longitudinal (with respect to the e+ spin polarization) magnetic field on the Doppler broadening of the 511 keV annihilation photon line. A novel data-analysis procedure allows the full information contained in the Doppler-broadened spectra to be extracted and the Ps-forming e+ fractions and the overlap of the e+ and e- wavefunctions in Ps to be deduced.

Original languageEnglish
Pages (from-to)213-228
Number of pages16
JournalZeitschrift fur Physikalische Chemie
Volume199
Issue number2
Publication statusPublished - Dec 1 1997

Keywords

  • Doppler broadening
  • Esr
  • Positron spin polarization
  • Positronium

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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