揭示 1 keV 以下 X 射线能谱中的 Fano 噪声与部分电荷收集效应
Unraveling Fano noise and partial charge collection effect in X-ray spectra below 1 keV
AI总结：
使用 Skipper-CCD 测量低能 X 射线，通过 PCC 效应与 Fano 噪声卷积的解析模型精确表征能谱，分离并量化了两者贡献，测定了 Fano 因子等参数，并首次实验观测到低能光电峰的偏度。
摘要：
Fano 噪声、读出噪声和部分电荷收集（PCC）效应共同导致了 Charge Coupled Devices (CCD) 测量中能谱的退化，在低能情况下尤为明显。本工作使用 Skipper-CCD 记录了由氟（677 eV）和铝（1486 eV）荧光产生的 X 射线，该器件可将读出噪声降至 0.2 e-。基于对 PCC 效应与 Fano 噪声卷积导致的光电峰形状的解析描述，我们实现了对能谱的精确表征。该描述使我们能够分离并量化 Fano 噪声和 PCC 效应两者的贡献。结果，我们测定了 Fano 因子和电子-空穴对产生能。此外，我们估计了传感器的 PCC 区域，并首次在实验上观测到了低能下光电峰预期的偏度。
英文摘要：
Fano noise, readout noise, and the partial charge collection (PCC) effect collectively contribute to the degradation of energy spectra in Charge Coupled Devices (CCD) measurements, especially at low energies. In this work, the X-ray produced by the fluorescence of fluorine (677 eV) and aluminum (1486 eV) were recorded using a Skipper-CCD, which enabled the reading noise to be reduced to 0.2 e-. Based on an analytical description of photopeak shapes resulting from the convolution of the PCC effect and Fano noise, we achieved a precise characterization of the energy spectra. This description enabled us to disentangle and quantify the contributions from both Fano noise and the PCC effect. As a result, we determined the Fano factor and the electron-hole pair creation energy. Additionally, we estimated the PCC-region of the sensor and, for the first time, experimentally observed the expected skewness of photopeaks at low energies.
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