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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9.7eV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9.7eV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100meV,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±0.2K.
A narrow-band pass vacuum ultraviolet photon detector used in the experiment of reflective electron spectroscopy was designed and constructed, which can count the photons with the energy of 9.7eV.The high-pass filtering of acetone working gas and the low energy cutoff of strontium fluoride window Of the narrow band pass effect of superimposed its geometry similar to a special Geigekeler type counter tube, filled with low-pressure gas mixture of acetone and argon, the mixing ratio of 1:20. Strontium fluoride as an entrance window , To prevent the entry of photons larger than 9.7eV, while acetone gas is used to capture photons, so that low-energy photons can not generate signals.Using the deuterium lamp grating monochromatic system to accurately calibrate the relationship between the window temperature and bandwidth, making the detector’s photon energy The bandpass width is less than 100 meV and can be continuously adjusted down by varying the temperature of the strontium fluoride window.The accuracy of the temperature control system can be up to ± 0.2K.