Photoemission (PE) from selected surfaces has been thoroughly investigated theoretically and experimentally in view of applications in large-area gas-avalanche photon imaging detectors (gaseous photomultipliers, GPM). PE studies were carried out in dedicated UHV systems on alkali-halide (mainly CsI), diamond and Bialkali photocathodes. Among parameters investigated were: absolute PE yields (e.g. QE) and its dependence on parameters including: surface growth, post-growth surface modifications, electric fields, operation in gas media etc. Post-treatments of Bialkali photocathodes included R&D on surface protection with alkali halide films. Our Bialkali photocathodes yielded very high quantum photo-yield (QE) values in the visible spectral range.
Department of Particle Physics and Astrophysics
Department of Particle Physics and Astrophysics
Radiation Detection Physics
