Abstract:
The results and possibilities of the samples surfaces research by
the Doppler method of positron annihilation spectroscopy (PAS) for a
monochromatic beam of positrons at the LEPTA facility are presented in
this paper. Method with high-resolution sensitivity to defects like
vacancies and dislocations allows scanning of the surface and near-surface
sample layers to a depth of several micrometers by the method of Doppler
broadening of annihilation lines. The opportunities for the development of
a PAS method based on the measurement of the positron lifetime in the
sample irradiated by ordered flow of positrons from the injector of
accelerator complex LEPTA at JINR are discussed.
