Dependence of quantum efficiency of alkali halide photocathodes on the radiation incidence angle
Dependence of quantum efficiency of alkali halide photocathodes on the radiation incidence angle
复制标题
碱卤化物光电阴极的量子效率对辐射入射角的依赖性
DOI：
10.1117/12.366524
复制
发表时间：
1999
影响因子：
2.6
通讯作者：
O. Siegmund
中科院分区：
文献类型：
--
作者：
A. Tremsin;O. Siegmund
本文研究了CsI、KBr和KI蒸发的反射式平面光电阴极在25-115 nm光谱范围内效率随入射角的变化。对于短波长，光电流随着光子入射角而增加，而在大约90-115 nm的波长处，光电流仅改变大约5%。基于光子吸收长度和光电子逸出长度的光阴极角响应的理论计算与实测数据符合较好。详细研究了在25-191 nm光谱范围内，CsI、KI和KBr光电阴极微通道板探测效率的角度变化。平面光电阴极的热退火没有导致其角响应的任何显著变化。
We studied variation efficiencies of CsI, KBr and KI- evaporated reflective planar phototcathodes with the angle of radiation incidence in the spectral range of 25-115 nm. The photocurrent increases with the photon incidence angle for short wavelengths, while it changes only approximately 5 percent at wavelengths approximately 90-115 nm. The theoretical calculations of the photocathode angular response based on the absorption length of the photons and the escape length of the photoelectronics are in a relatively good agreement with the measured data. A detailed study of the detection efficiency angular variation for the microchannel plates with CsI, KI and KBr photocathodes in the spectral range of 25-191 nm is also presented. Heat annealing of the planar photocathodes did not result in any significant variation in their angular response.