LPA Prague

High resolution positron lifetime spectroscopy

• two spectrometers equipped with BaF₂ scintillators and Hamamatsu H3378 or Photonis XP2020/Q photomultipliers
• excellent time resolution of 145 ps and 133 ps, respectively
• ²²Na positron source with activity 1 MBq
• measurement at room temperature
• temperature controlled measurements at low temperatures from 300 K down to 10 K
• special holder for measurement at elevated temperatures from 300 to 600 K

Coincidence Doppler broadening spectroscopy (CDB)

• two spectrometers equipped with a pair of high purity germanium (HPGe) detectors

- one of them is first fully digital CDB spectrometer of new generation developed in the world which enables to achieve extremely low background
- energy resolution of 0.88 keV at the annihilation line and peak-to-background ratio better than 106

• CDB spectrum carries information about local chemical environment of defects

Slow-positron beam

• magnetically guided slow-positron beam intended for positron back-diffusion measurements and investigations of thin films
• energy of positrons in the beam can be varied in the range 0.01-30 keV
• equipped with a chamber deposition of thin films by electron beam evaporation

Further information can be found here.