The influence of exposure to air on the quantum efficiency of thin CsI photocathodes

Authors
Razin, VI Gotovcev, YN Kurepin, AB Reshetin, AI
Citation
Vi. Razin et al., The influence of exposure to air on the quantum efficiency of thin CsI photocathodes, NUCL INST A, 419(2-3), 1998, pp. 621-622
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences","Instrumentation & Measurement
Journal title
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
ISSN journal
01689002 → ACNP
Volume
419
Issue
2-3
Year of publication
1998
Pages
621 - 622
Database
ISI
SICI code
0168-9002(199812)419:2-3<621:TIOETA>2.0.ZU;2-U
Abstract
The ageing of CsI film by exposure to air is discussed. Such exposures may take place during the transfer of a CsI photocathode from the evaporation v essel to the detector. The direct current (DC) was measured using a deuteri um lamp for UV irradiation. It has been recorded as a function of the lengt h of exposure to air for the case of small photocathodes. A 1 h exposure wa s found to have no remarkable effect in comparison to 8 or 15 min, but the current was decreased by 90% after 24 h exposure. A simple technique for Cs I evaporation has been developed. (C) 1998 Elsevier Science B.V. All rights reserved.