铥原子激发态光电离截面的实验研究  

Experimental Study of Excited State Photoionization Cross-Section of Thulium Atoms

作　　者：袁紫灵 张振美 王郅诚 秦正波 郑贤锋[1] 崔执凤[1] YUAN Zi-ling;ZHANG Zhen-mei;WANG Zhi-cheng;QIN Zheng-bo;ZHENG Xian-feng;CUI Zhi-feng(Anhui Province Key Laboratory of Optoelectric Materials Science and Technology,Anhui Normal University,Wuhu 241002,China)

机构地区：[1]安徽师范大学光电材料科学与技术安徽省重点实验室,安徽芜湖241002

出　　处：《安徽师范大学学报（自然科学版）》2023年第3期222-227,236,共7页Journal of Anhui Normal University(Natural Science)

基　　金：国家自然科学基金项目(12074004)。

摘　　要：本文采用激光烧蚀技术和超声分子束技术相结合,制备了高密度、低能态的自由铥(Tm)原子束。由可调谐激光制备原子电子激发态同时实现从激发态的光电离,由飞行时间质谱来探测来自不同电子激发态的光电离信号在245-266.3nm范围扫描激光波长,获得Tm原子UV区共振增强多光子电离光谱(REMPI光谱)。对于确定的激光共振波长,实验测定了不同激光能量下的光电离信号强度,进而得到Tm原子相应电子激发态的绝对光电离截面,测得的绝对光电离截面值在6.01±0.31~15.65±0.7Mb范围内。In this paper,a high-density,low-energy free thulium(Tm)atomic beam was prepared by combining laser ablation technology and ultrasonic molecular beam technology.The ionization of atomic electron excited states is simultaneously realized by tunable laser,and photoionization from excited states is detected by time-offlight mass spectrometry to detect photoionization signals from different electron excited states in the range of 245-266.3nm to obtain Tm atom UV region resonance-enhanced multiphoton ionization spectroscopy(REMPI spectroscopy).For the determined laser resonance wavelength,the photoionization signal intensity under different laser energies was determined experimentally,and then the absolute photoionization cross-section of the corresponding electron excited state of the Tm atom was obtained,and the measured absolute photoionization crosssection value was in the range of 6.01±0.31~15.65±0.7Mb.

关 键 词：铥原子 激发态 自由原子束 共振增强多光子电离光谱 光电离截面 

分 类 号：O562.4[理学—原子与分子物理]