Stability of quantum efficiency and visible light rejection of alkali halide photocathodes

Details Stability of quantum efficiency and visible light rejection of alkali halide photocathodes Stability of quantum efficiency and visible light rejection of alkali halide photocathodes

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000spie.4013..411t&link_type=abstract

Proc. SPIE Vol. 4013, p. 411-420, UV, Optical, and IR Space Telescopes and Instruments, James B. Breckinridge; Peter Jakobsen; E

Physics

1

Scientific paper

We have studied the UV sensitivity degradation of CsI and KBr thin films under UV illumination and the stability of their visible light rejection for CsI and KBr opaque photocathodes evaporated on microchannel plates. For both materials the greatest degradation of the relative quantum detection efficiency was observed near the photocathode sensitivity cut off, while there was almost no change in their EUV response. The aging of the photocathodes is likely to be independent of the angle of radiation incidence. Of the two materials the CsI films appeared to be more solar blind and less subject to visible sensitivity activation by UV exposure.

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