Abstract
The high and low density sandwich CsI photocathodes have been developed and optimized to yield relatively stable and efficient systems for photon detection in the 0.1–10 keV region. For sandwich CsI photocathodes, the photon detecting effeciency is 2–10 times higher than that obtained with the high density CsI photocathodes in the 0.1–10 keV region. The energy distributions of the photoemitted secondary electrons have been measured to be similar to the high density photocathodes and with about 2eV full-widthhalf-maximum. The high efficiencies and relatively narrow emitted electron energy distributions have made the CsI transmission photocathodes extensively useful in softX-ray detectors and counters especially inX-ray streak camera applications.
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