UV AND XUV QUANTUM DETECTION EFFICIENCIES OF CSI-COATED MICROCHANNEL PLATES

Abstract Quantum efficiency measurements are presented for CsI-coated microchannel plates in the waveband 25–200 nm. The influence of exposure to a humid atmosphere on the efficiency of the CsI-photocathode has been studied in great detail. Due to the very high susceptibility of CsI to humidity, particularly for wavelengths longer than 140 nm, the best quantum efficiencies have been obtained for a CsI-coated channelplate continuously stored in vacuum. The results are interpreted on the basis of photoelectron emission theory.

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