Browsing by Author "Siemek, Krzysztof"
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Item Positron annihilation spectroscopy on a beam of positrons the LEPTA facility(EPJ Web of Conferences, 2017) Siemek, Krzysztof; Horodek, PawełThe 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.