TY - JOUR
T1 - Laterally resolved measurements of polycrystalline cesium iodide surfaces
AU - Rudolf, Petra
AU - Marchal, Frédéric
AU - Sporken, Robert
AU - Caudano, Roland
AU - Dell'Orto, Tiziana
AU - Almeida, Jorge
AU - Braem, A.
AU - Piuz, François
AU - Sgobba, Stefano
AU - Paic, Guy
AU - Nappi, Eugenio
AU - Valentini, A.
AU - Sartori, Paolo
AU - Coluzza, Carlo
N1 - Publication code : **RES. ACAD.
PY - 1997
Y1 - 1997
N2 - The aim of this work was to establish the correlation between the local chemical composition and morphology of polycrystalline cesium iodide (CsI) and its local quantum efficiency. We used a laterally resolved Electron Spectroscopy for Chemical Analysis (ESCA-300) apparatus and a Scanning Auger Microprobe (SAM) to investigate the lateral inhomogeneity of the CsI surface stoichiometry. The local quantum efficiency (QE) was determined by measuring the secondary electron emission in Photoemission Electron Microscopy both with a non-monochromatized deuterium lamp and with tunable X-ray synchrotron radiation as the excitation source. CsI films on different substrates were studied. We found that the local QE depends strongly on the morphology, on the local stoichiometry and on carbon contamination. The results allow for an optimisation of the quantum efficiency of large area photocathodes.
AB - The aim of this work was to establish the correlation between the local chemical composition and morphology of polycrystalline cesium iodide (CsI) and its local quantum efficiency. We used a laterally resolved Electron Spectroscopy for Chemical Analysis (ESCA-300) apparatus and a Scanning Auger Microprobe (SAM) to investigate the lateral inhomogeneity of the CsI surface stoichiometry. The local quantum efficiency (QE) was determined by measuring the secondary electron emission in Photoemission Electron Microscopy both with a non-monochromatized deuterium lamp and with tunable X-ray synchrotron radiation as the excitation source. CsI films on different substrates were studied. We found that the local QE depends strongly on the morphology, on the local stoichiometry and on carbon contamination. The results allow for an optimisation of the quantum efficiency of large area photocathodes.
U2 - 10.1016/S0168-9002(96)00981-3
DO - 10.1016/S0168-9002(96)00981-3
M3 - Article
SN - 0168-9002
VL - 387
SP - 163
EP - 170
JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
IS - 1-2
ER -