Photoelectron energy spectra of opaque photocathodes in the extreme and far ultraviolet

Astronomy and Astrophysics – Astronomy

Scientific paper

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Energy Spectra, Extreme Ultraviolet Radiation, Photocathodes, Photoelectron Spectroscopy, Fabrication, Microchannel Plates, Quantum Efficiency, Ultraviolet Spectra

Scientific paper

Measurements of the EUV quantum detection efficiency (QDE) of opaque RbBr, CsBr, and KBr photocathodes are described and investigations of their photoemission characteristics over the 44-1560 A wavelength range are reported. The results show that high QDEs can be obtained in the EUV. Narrow QDE peaks at soft X-ray wavelengths occur at slightly different wavelengths for each of the materials studied. The long-wavelength thresholds vary according to the material band gap. Data on the photoemission from the photocathode layer on the microchannel plate interchannel web area are used to determine the number and energy distribution of the emitted photoelelectrons as a function of wavelength.

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