设计并构造了一种用于反光电子能谱实验的窄带通真空紫外光子探测器, 可以对能量在9.7 eV附近的光子进行计数.利用丙酮工作气体高通滤波与氟化锶窗口低能截止两种作用的叠加实现窄带通的效果.它的几何结构类似于一种特殊的盖革米勒型计数管, 内部填充低气压丙酮和氩气混合气体, 混合比例为1∶20.氟化锶作为入口窗, 阻止大于9.7 eV的光子进入, 而丙酮气用于捕获光子, 使低能光子不能产生信号.利用氘灯光栅单色系统对窗口温度同带宽的关系进行了精确校定, 使得探测器的光子能量带通宽度低于100 meV, 并可以通过变化氟化锶窗的温度, 使其可以被连续调整下降.温度控制系统的准确度可以达到±0.2 K.

This paper presents a novel Vacuum Ultraviolet (VUV) bandpass photon-counting detector which was designed to count photons with energies approximately 9.70 eV for inverse photoemission spectroscopy experiments. The performance was analyzed to improve the signal-to-noise ratio and resolution of the spectrum. The geometric structure of this detector is similar to a special Geiger-Müller tube. It is filled with a dilute mixture of acetone vapor and argon gas. The proportion was investigated and ascertained to be close to 1 to 20. A SrF2 crystal was used as the input window to cut off high-energy photons with energies greater than 9.7 eV. Acetone vapor was selected as the functional gas to capture photons. Moreover, it can prevent low energy photons from being detected. The optical bandpass width is less than 100 meV and can be tuned continuously by cooling the SrF2 window. The temperature is controlled by a self-developed cryogenic system with accuracy of±0.2 K. The relationship between the detector bandpass width and the SrF2 window temperature is calibrated using a deuterium lamp and a grating monochromator.