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Positron Annihihtion in Colour Centres
Author(s) -
Nagarajan T.,
Ramasamy P.,
Ramasamy S.
Publication year - 1977
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220820105
Subject(s) - positron , irradiation , full width at half maximum , doping , positron annihilation , annihilation , atomic physics , trapping , electron , materials science , physics , radiochemistry , chemistry , nuclear physics , optoelectronics , ecology , biology
The angular correlation of positron annihilation in NaCl and KCl is compared for various concentrations of F‐centres produced by γ‐irradiation as well as additive doping. The intensity and the “full width at half‐maximum (FWHM)“ ‐Γ 1/2 of the narrow component are slightly different for each of the X‐irradiated, electron‐irradiated, γ‐irradiated (light and heavy doses), and addi‐tively doped crystals. The possible role of additional defect centres in trapping positrons is discussed. Also angular correlation measurements of positrons annihilating in the reversible F ⇌ F' conversion centres in equilibrium in additively coloured KCI at −100 °C are given.