中文摘要：

基于狭义相对论的基本观点，研究了特征X射线的产生机理，分析了电子自旋轨道耦合对特征X射线波长的影响，导出了一个计算特征X射线波长的公式，同时对计算推导的波长值做了系统的误差分析，得到了相对误差的规律.结果表明，计算推导的波长值与实验的波长值非常接近，在实际应用中对分析特征X射线光谱具有一定的参考意义.

英文摘要：

Based on special relativity, the formation mechanism of characteristic X-ray was studied, and the influence of the spin-orbit coupling on the characteristic X-ray wavelength was analyzed. A calculation formula of the X-ray wavelength based on special relativity is obtained. Error analysis is carried out systematically for the calculation values of wavelength, and the rules of relative error are obtained. It is shown that the results of the calculation are very close to the experimental results, which have some reference meaning for spectrum analysis of characteristic X-ray in application.