软X射线光束线能量分辨率测量中气体压强对谱线的影响研究  

Effect of gas pressure on energy resolution of a soft X-ray beamline

作　　者：薛超凡[1] 王勇[1] 吴衍青[1] 许子健[1] 邰仁忠[1] 

机构地区：[1]中国科学院上海应用物理研究所,上海201204

出　　处：《核技术》2011年第8期561-564,共4页Nuclear Techniques

摘　　要：同步辐射软X射线光束线通常利用气体电离室来标定单色仪的能量及测量能量分辨率,通过分析拟合所得谱线的半高宽,可以对光束线的能量分辨能力进行定量评估。然而,传统的分析方法往往忽略了谱线中气体碰撞展宽的影响,从而导致所得能量分辨率略低于真实值。通过讨论气压对测量所得的谱线宽度的影响,提出了一种考虑气压修正的能量分辨率计算方法,该方法经实验验证是有效可靠的。Ionization chamber is often used to calibrate photon energy of the monochromator and evaluate quantitatively the energy resolving power by measuring photoabsorption or photoionization spectra of various gases. However, the effect of gas collision broadening is usually ignored in conventional method, which results in lower energy resolution than the true value. In this paper, the effect of gas pressure is discussed and an analytical method with gas pressure correction is proposed. It can effectively eliminate the effect of gas collision broadening.

关 键 词：同步辐射 能量分辨率 气体电离室 气压修正 

分 类 号：TL811.1[核科学技术—核技术及应用]