阈值光电子分析器及其在原子分子光电离研究中的应用

THRESHOLD PHOTOELECTRON ANALYZER AND ITS APPLICATION IN PHOTOIONOZATION OF ATOMS AND MOLECULES

合肥国家同步辐射实验室（ＮＳＲＬ）光化学实验站上，国内首例用于研究原子、分子结构的阈值光电子谱（ＴＰＥＳ）技术。系统给出了阈值光电子分析器的结构和原理、检测控制系统、性能测试以及提高系统分辨率的措施和想法等，用该装置获得了一些分子的阈值光电子谱、及采用离子飞行时间质谱（ＴＯＦＭＳ）得到的光离子效率谱（ＰＩＥＳ）。用Ａｒ￣＋（￣２Ｐ＿（１／２）和Ｋｒ￣＋（￣２Ｐ＿（１／２）峰作标定，我们的阈值光电子分析器分别获得了２０ｍｅｖ和１７ｍｅＶ能量分辨（ＦＷＨＭ）。通过对Ｎ＿２分子在６３０－８１０振动态和Ｒｇｄｂｅｒｇ自电离态的初步探讨可知该系统性能。

A threshold photoelectron analyzer used to study photoionization of Atoms andmolecules at the Photochemistry experimental station of NSRL. The main features ofthis analyzer including the experimental arramgement, detection and operation systemshave been discussed. Threshold photoelectron spectra and photoionization efficiencycurves were measured. The FWHM of 20meV (Ar+'P,,, ) and 17meV (Kr+'P,,, ) w+asobtained from the TPES of Ar and Kr. Vibrational levels and Rydberg series of Nc (630k -sl0A ) were investigated, which show a good energy resolution.