A Plasma Injection Ion Source for Photoelectron Imaging of Metal-Containing Anions  

用于含金属负离子光电子成像研究的等离子体注入式离子源

作　　者：Shaowen Feng Zhen Li Wenli Liu Qiang Zhang Yang Chen Dongfeng Zhao 冯绍文;李珍;刘文莉;张强;陈旸;赵东锋(中国科学技术大学化学物理系,合肥微尺度物质科学国家研究中心,合肥230026)

机构地区：[1]Hefei National Research Center for Physical Sciences at the Microscale,and Department of Chemical Physics,University of Science and Technology of China,Hefei 230026,China

出　　处：《Chinese Journal of Chemical Physics》2025年第1期1-7,I0055,共8页化学物理学报(英文)

基　　金：supports from the National Natural Science Foundation of China(No.22173089,No.21827804,and No.22103075);the National Key R&D Program of China(No.2021YFA0716801 and No.2017YFA0303502).

摘　　要：A plasma injection ion source has been de-veloped for the photoelectron velocity imag-ing studies of metal-containing anions.The source employs a pulse discharge nozzle for generating a plasma beam that perpendicu-larly crosses the master supersonic jet beam from a home-made pulsed piezo valve.The discharge nozzle is designed for high voltage gas discharge with efficient metal sputtering of the cathode,and thus plays a role in met-al atom and ion source.Supersonically jet-cooled anions can be produced in the master gas jet via reactions of the plasma products.The source is integrated into a photoelectron ve-locity imaging spectrometer.Test mass spectrometry experiments show that the ion source can efficiently produce transition metal containing anions,such as FeO_(m)^(-),CuO_(m)^(-),CuC_(n)^(-),CuC_(n)O_(m)^(-).The photoelectron imaging results by photodetachment of O-show that the pho-toelectron energy resolution of the whole instrument isΔE/E≈2.3%,and the results of FeO^(-)indicate that internal temperatures of anions from the source could be efficiently cooled down.本文介绍一套用于含金属气相负离子和团簇光电子速度成像研究的等离子体注入式离子源.该离子源采用自主设计的压电脉冲阀产生主超声射流分子束,通过将脉冲放电喷嘴产生等离子体束流垂直注入到主分子束实现负离子和团簇的高效制备和冷却.脉冲放电喷嘴通过高压气体放电获得阴极表面的有效金属溅射,进而在主分子束的碰撞区发进行复杂化学反应和超声射流冷却.将该离子源与光电子速度成像装置联用进行测试实验,结果表明,离子源可以有效制备FeO_(m)^(-)、CuO_(m)^(-)、CuC_(n)^(-)、CuCnO_(m)^(-)等负离子和团簇O^(-)光电子成像结果表明,整套仪器的能量分辨率约2.31%.FeO^(-)光电子成像结果表明,该方法制备的负离子的内部温度可以被有效冷却。

关 键 词：Anion source Pulsed piezo valve Photoelectron imaging 

分 类 号：O53[理学—等离子体物理]