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.
|Number of pages||16|
|Journal||Zeitschrift fur Physikalische Chemie|
|Publication status||Published - Dec 1 1997|
- Doppler broadening
- Positron spin polarization
ASJC Scopus subject areas
- Physical and Theoretical Chemistry