Thiede Christian, Schmidt Anke B, Donath Markus
Physikalisches Institut, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Straße 10, 48149 Münster, Germany.
Rev Sci Instrum. 2015 Aug;86(8):085101. doi: 10.1063/1.4927459.
Bandpass photon detectors are widely used in inverse photoemission in the isochromat mode at energies in the vacuum-ultraviolet spectral range. The energy bandpass of gas-filled counters is usually formed by the ionization threshold of the counting gas as high-pass filter and the transmission cutoff of an alkaline earth fluoride window as low-pass filter. The transmission characteristics of the window have, therefore, a crucial impact on the detector performance. We present transmission measurements in the vacuum-ultraviolet spectral range for alkaline earth fluoride window crystals in the vicinity of the transmission cutoff as a function of crystal purity, surface finish, surface contamination, temperature, and thickness. Our findings reveal that the transmission characteristics of the window crystal and, thus, the detector performance depend critically on these window parameters.
带通光子探测器广泛应用于真空紫外光谱范围内等色仪模式的逆光电发射中。充气计数器的能带通通常由计数气体的电离阈值作为高通滤波器以及碱土氟化物窗口的透射截止作为低通滤波器形成。因此，窗口的透射特性对探测器性能有至关重要的影响。我们给出了在真空紫外光谱范围内，碱土氟化物窗口晶体在透射截止附近的透射测量结果，该结果是晶体纯度、表面光洁度、表面污染、温度和厚度的函数。我们的研究结果表明，窗口晶体的透射特性以及探测器性能关键取决于这些窗口参数。
