质子轰击钨靶表面时的电子发射产额与靶温度的相关性研究  

Study on the Correlation Between Electron Emission Yield and Temperature of Tungsten Target Bombarded by H^(+) Ion

作　　者：曾利霞[1,2] 周贤明 梅策香[1] 程锐[3] 张小安[1,3] 徐忠锋[2] ZENG Lixia;ZHOU Xianming;MEI Cexiang;CHENG Rui;ZHANG Xiaoan;XU Zhongfeng(Ion Beam and Optical Physical Joint Laboratory of Xianyang Normal University and Institute of Modern Physics,Chinese Academy of Sciences,Xianyang 712000,Shaanxi,China;Institute of Science and Technology for Laser and Particle Beams,Xi’an Jiaotong University,Xi’an 710049,China;Institute of Modern Physics,Chinese Academy of Science,Lanzhou 730000,China)

机构地区：[1]咸阳师范学院与中国科学院近代物理研究所联合共建:离子束与光物理实验室,陕西咸阳712000 [2]西安交通大学激光和粒子束科学与技术研究所,西安710049 [3]中国科学院近代物理研究所,兰州730000

出　　处：《原子核物理评论》2022年第2期232-237,共6页Nuclear Physics Review

基　　金：国家自然科学基金资助项目(11605147,11375138,11505248);陕西省自然科学基金资助项目(2019JQ-493,2021JQ-812);陕西省教育厅科研计划资助项目(20JK0975,16JK1824);陕西高校青年杰出人才支持计划项目;咸阳师范学院“中青年拔尖人才”项目(XSYBJ202004);咸阳师范学院“学术带头人”项目(XSYXSDT202109);咸阳师范学院专项科研基金资助项目(XSYK19042,XSYK19043);咸阳师范学院校级金课建设项目;咸阳师范学院2020年课程思政示范课项目。

摘　　要：在中国科学院近代物理研究所兰州重离子加速器国家实验室测量了能量为50~250 keV的质子入射不同温度下钨靶表面的电子发射产额。实验结果发现,不同能量的质子引起的电子发射产额均随着靶温度的升高而降低;利用功函数对温度的依赖性定性地解释了该结果。在不同靶温度下,总电子发射产额与电子能损的比值随着质子能量的增加而逐渐变小;利用靶原子不同壳层中电子之间的电离竞争机制来解释实验结果。The electron emission yield of protons with an energy range of 50~250 keV incident on tungsten surface of a target at different temperatures are measured on the 320 kV electron cyclotron resonance ion source(ECRIS) platform of the Institute of Modern Physics,Chinese Academy of Science(IMP,CAS) in Lanzhou.It is shown that the electron emission yield induced by protons with different energies decreases with the increase of target temperature.The results were qualitatively explained by the temperature dependence of the work function.At different target temperatures,the ratio of total electron emission yield to electronic stopping power decreases with the increase of incident ion energy.The ionization competition between electrons in different shells of the target atom is used to explain the experimental results.

关 键 词：质子 电子发射产额 阈值速度 功函数 

分 类 号：O562.4[理学—原子与分子物理]