Open AccessCalculation of quantum efficiency of alkali halide photocathode materials in the extreme ultraviolet region
Author(s) -
Min Li,
Qin Ni,
Bin Chen
Publication year - 2009
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.58.6894
Subject(s) - photocathode , secondary electrons , quantum yield , secondary emission , electron , yield (engineering) , materials science , alkali metal , quantum efficiency , halide , microchannel plate detector , photon , atomic physics , ultraviolet , optics , physics , optoelectronics , chemistry , inorganic chemistry , nuclear physics , fluorescence , quantum mechanics , metallurgy
In order to meet the requirement of microchannel plate position-sensitive photon counting detector in the extreme ultraviolet region, the quantum efficiency of alkali halide photocathode was studied. Based on the fact that the photoemission from photocathode is formed by secondary electrons, the theoretical model of secondary electron emission for alkali halide photocathode was presented and the formula of secondary electron yield was obtained. For photon energy ranging from 30 to 250 eV, the effect of the thickness of photocathode and the incidence angle on the secondary electron yield was calculated and analyzedthe result showed that when the thickness was higher than 100 nm and the grazing angle was larger than the critical angle of photocathode material, high secondary electron yield was obtained. Finally, according to the derived formula, the spectrum response of the secondary electron yield for twenty alkali halides was analyzed and the result showed that the position of the peak yield was in accordance with the resonant absorption of photocathode materials.