Precision measurement of the Sherman asymmetry function for electron scattering from gold.
Precision measurement of the Sherman asymmetry function for electron scattering from gold.
复制标题
精确测量金电子散射的谢尔曼不对称函数。
DOI：
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发表时间：
1991
期刊：
影响因子：
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通讯作者：
Kessler
中科院分区：
文献类型：
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作者：
Gellrich;Kessler
在经典的电子二次散射实验中，测量了金的非对称性(谢尔曼)函数随箔厚度的变化。给出了散射角为45度、60度、75度、105度、110度、115度、120度、125度和130度时，入射能量分别为50和120keV的结果。由于我们使用了一致的方法来处理虚假的不对称性，所以测量具有高度的重复性。不对称函数的绝对值是用两个相同的箔确定的，在120keV和50keV分别为222{u}g/cm{sup 2}和71{u}g/cm{sup 2}。对这些校准点的不确定度分析表明，它们的不确定度在0.3%以下。讨论了数据外推到零箔厚度的问题，并与理论进行了比较。
Measurements of the asymmetry (Sherman) function for gold as a function of foil thickness have been made in a classical' electron double-scattering experiment. Results are presented for incident energies of 50 and 120 keV at scattering angles of 45{degree}, 60{degree}, 75{degree}, 105{degree}, 110{degree}, 115{degree}, 120{degree}, 125{degree}, and 130{degree}. The measurements were highly reproducible owing to the consistent method we used for coping with spurious asymmetries. Absolute values of the asymmetry function were determined using two identical foils of 222 {mu}g/cm{sup 2} at 120 keV and 71 {mu}g/cm{sup 2} at 50 keV. An analysis of the uncertainties at these calibration points shows that they are below 0.3%. Extrapolation of the data to zero foil thickness and comparison with theory are critically discussed.