用能量色散型X射线衍射仪测量普朗克常量  

Measuring the Planck constant using the energy dispersive X-ray diffractometer

作　　者：武宝一 王春梅[1] 沈国土[1] WU Baoyi;WANG Chunmei;SHEN Guotu(School of Physics and Electronic Science,East China Normal University,Shanghai 200241,Chi)

机构地区：[1]华东师范大学物理与电子科学学院,上海200241

出　　处：《物理实验》2025年第4期37-41,共5页Physics Experimentation

基　　金：华东师范大学课程思政教育教学改革研究课题(No.2023KCSZ11);2023年度上海高校市级重点课程项目。

摘　　要：X射线衍射仪可以采用X射线谱短波限法测量普朗克常量.通过能量色散模式测得衍射峰道序号,再利用相邻衍射级次的布拉格衍射方程,得到普朗克常量.通过对不同角度的数据进行线性拟合,可以提高测量精度.本文采用不同的定标方式、对衍射峰道序号进行高斯拟合以及不同的总道数的改进方法,研究了能量色散方式测量普朗克常量的实验误差.实验结果表明:采用不同的定标方式以及对道序号进行拟合可以减小普朗克常量的测量误差,使用不同总道数的实验结果则无显著差别.The X-ray diffractometer can measure the Planck constant on the basis of the short-wave limit method of X-ray spectrum.The channel number of diffraction peak can be measured by the energy dispersion mode.The Planck constant can be obtained by using the Bragg diffraction equation of adjacent diffraction orders,and the data from different angles can be linearly fitted to improve the measurement accuracy.The measuring error of Planck constant using energy dispersion method was discussed,and three methods were adopted for improvement,including different calibration methods,Gaussian fitting of diffraction peak channel numbers,and different total channel numbers.The results showed that using different calibration methods and fitting channel numbers could reduce errors,while the total channel numbers did not show significant differences.

关 键 词：普朗克常量 X射线衍射仪 布拉格衍射 

分 类 号：O434.1[机械工程—光学工程]