In the laboratory, we have two main measurement systems; Positron Annihilation Lifetime Spectroscopy (PALS) as a fast-fast coincidence system and Doppler Broadenning Annihilation Spectroscopy (DBAR). The first measures lifetime of ortho-positronium (o-Ps) as a measure of free volume in materials and the latter measures broadened spectra of annihilation radition that gives information about free volume hole sizes and chemical defects in materials.
We have also Slow Positron Beam System (SLOPOS) to study surfaces and interfaces. We measure depth defect (vacancy and chemical) profile of surfaces changing the positron energy up to 30 keV. We have DBAR or DBES (Doppler Broadening Emission Spectroscopy) ready to run but we are still working on the lifetime spectroscopy.
Fast-Fast Coincidence System:
Positronium Annihilation Lifetime Spectroscopy (PALS, PLTAS)
Doppler Broadenning Annihilation Radiation (DBAR)
Slow Positron Beam System:
Doppler Broadenning Emission Spectroscopy (DBES)
Positron Emission Lifetime Spectroscopy (PELS)(not ready yet)
This page updated by Pozitron/Pozitronyum Araştırma ve Hizmet Laboratuvarı on 11.02.2019 22:46:10