Detection efficiency of a heavy ion time‐of‐flight spectrometer with thin carbon foils in the start detector
Detection efficiency of a heavy ion time‐of‐flight spectrometer with thin carbon foils in the start detector
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起始探测器中带有薄碳箔的重离子飞行时间谱仪的探测效率
DOI：
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发表时间：
1982
期刊：
影响因子：
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通讯作者：
B. Wilken
中科院分区：
文献类型：
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作者：
W. Stüdemann;B. Wilken
我们报告了在宽能量范围内通过厚度为4.5、6.7和16.9 μg/cm 2的碳箔的重离子散射效应的测量结果。为了将结果与理论预测进行比较，通过用表列的阻止本领测量能量损失来确定实际的箔厚度。利用这些厚度，测量结果一般与理论吻合得很好。然而，特别是对于4.5 μg/cm 2箔，发现与规定厚度的显著偏差很可能是由于额外的覆盖层。结果用于确定基于飞行时间方法的仪器中低能重离子的检测效率损失，其中薄碳箔用作二次电子的转换器。
We report measurements of the effect of heavy‐ion scattering due to the passage through carbon foils with thicknesses of 4.5, 6.7, and 16.9 μg/cm2 in a wide energy range. For comparison of the results with theoretical predictions the actual foil thicknesses were determined by scaling energy loss measurements with tabulated stopping powers. Using these thicknesses the measurements in general agree well with theory. However, particularly for the 4.5 μg/cm2 foil, significant deviations from the specified thickness have been found very likely due to additional cover layers. The results are used to determine the loss in detection efficiency for low‐energy heavy ions in instruments based on the time‐of‐flight method with thin carbon foils acting as converters for secondary electrons.