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R. Hemphill, J. Edelstein, and D. Rogers
The quantum detection efficiency (QDE) of photon counting microchannel plate detector channels can be increased by a factor of two in the extreme ultraviolet bandpass, from 256 A to 1024 A, by subjecting the input channel plate to a chemical solution treatment. The efficiency increase has proven insensitive to the exposure of laboratory atmosphere and is stable over the extracted charge lifetime equivalent of multi-year astrophysical observations. Chemically treated microchannel plates that are overcoated with opaque photocathodes of KBr and CsI show a factor of two QDE increase from 834 A to 1100 A in comparison with previous measurements using conventional untreated microchannel plates.
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