We present an absolute energy measurement of the K β 1,3 (KM 2,3 ) emission spectrum of scandium ( Z = 21) accurate to 2.1 parts per million (ppm). The previous experimental uncertainty was estimated as 105 ppm, or 0.47 eV, therefore we improve the accuracy of this measurement by a factor of 50 for use in any x-ray standards. There is a long-standing discrepancy between the most recent experimental and theoretical values. This work reports a Sc K β peak energy of 4460.845 eV with estimated standard error uncertainty of 0.0092 eV. The satellite component centroids, line-widths, and relative intensities are determined as a sum of five Voigt functions. The same analysis and experimental method shown here can be applied to advanced experiments in quantum electrodynamics, astrophysics and particle physics on soft x-ray spectra. This value has reconciled some of the previous discrepancy. However, the theoretical value is still discrepant from the ...

中文翻译：

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βKβ的绝对能量表征为百万分之2

我们提出了（（Z = 21）的Kβ1,3（KM 2,3）发射光谱的绝对能量测量，精确到百万分之2.1（ppm）。先前的实验不确定度估计为105 ppm或0.47 eV，因此，在任何X射线标准中使用时，我们将测量精度提高了50倍。最新的实验值和理论值之间存在长期的差异。这项工作报告的Sc Kβ峰值能量为4468.845 eV，估计的标准误差不确定度为0.0092 eV。卫星分量质心，线宽和相对强度确定为五个Voigt函数的总和。此处显示的相同分析和实验方法可以应用于在软X射线光谱上的量子电动力学，天体物理学和粒子物理学的高级实验。此值已调和以前的一些差异。但是，理论值仍与...