129Xeq+离子入射Cu靶表面激发的近红外光谱线和X射线谱  

129Xeq+induced near-infrared light and X-ray emission at Cu surface

作　　者：张小安[1,2] 梅策香[1] 张颖[1] 梁昌慧[1] 周贤明 曾利霞[1] 李耀宗[1] 柳钰[1] 向前兰 孟惠[1] 王益军 Zhang Xiao-An;Mei Ce-Xiang;Zhang Ying;Liang Chang-Hui;Zhou Xian-Ming;Zeng Li-Xia;Li Yao-Zong;Liu Yu;Xiang Qian-Lan;Meng Hui;Wang Yi-Jun(Ion Beam and Optical Physical Joint Laboratory of Xianyang Normal University and Institute of Modern Physics,Chinese Academy of Sciences,Xianyang 712000,China;Institute of Modern Physics,Chinese Academy of Sciences,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,咸阳712000 [2]中国科学院近代物理研究所,兰州730000

出　　处：《物理学报》2020年第21期25-33,共9页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11605147,11075135);陕西省科技厅自然科学基础研究计划(批准号:2020JM-624)资助的课题.

摘　　要：利用动能一定(1360 keV)的高电荷态129Xeq+(q=21,23,25,27)离子束和动能为4 MeV的129Xe20+离子束分别入射洁净的Cu靶表面,流强为nA量级,离子在飞秒时间尺度内俘获靶电子完成中性化,能量沉积在靶表面使靶原子离化和激发,发生复杂组态之间的跃迁.测量到了炮弹离子中性化后的Xe原子退激跃迁辐射的近红外光谱线和相互作用过程中激发和离化的靶原子退激辐射的近红外光谱线,其中包括偶极禁戒跃迁(磁偶极和电四极跃迁)和Cu22+的磁偶极退激辐射跃迁的近红外光谱线.4 MeV的129Xe20+离子入射Cu靶表面,测量到Cu22+的软X射线、Cu原子的L1 edge和Lb3跃迁辐射的X射线以及高电荷态129Xe20+中性化后Xe原子退激辐射的Lh和Lb3 X射线.结果表明,低速高电荷态129Xeq+离子入射金属表面中性化过程中,离子中性化退激和激发离化靶原子辐射红外光谱线,近红外谱线的单离子荧光产额增加的趋势与入射离子的势能增加趋势相同.Xe原子的特征L X射线是炮弹离子进入表面下形成的第二代空心原子发射的.During the interaction of highly charged ions with solid target in the energy region near the Bohr velocity,the potential energy of the projectiles will be deposited on a nanometer-scale target surface within the time on the order of femtoseconds.That will lead the target atoms to be ionized into ions and the ions to be excited,resulting in the multiple ionization states and the complex configuration of energy levels.The de-excitation radiations of these levels cover the radiations from near-infrared spectral line to X-ray.Investigation of these spectral lines is significant for investigating the mechanism of such an interaction,diagnosing plasma and studying astrophysics.The experimental results show that the near-infrared spectral lines and X-ray spectra are produced by the 129Xeq+(q=21,23,25,27)with kinetic energy of 1360 keV and 129Xe20+with kinetic energy of 4 MeV impacting on the Cu surface,separately.The experiment is carried out in the National Laboratory of Heavy Ion Research Facility in Lanzhou,HIRFL.The beam intensity is on the order of nA.The highly charged ions capture the electrons of the Cu target and thus being neutralized in a femtosecond time.The energy of the highly charged ions is deposited on the target surface,and the target atoms are excited or ionized,resulting in the transition between complex configurations,such as the dipole forbidden transition(magnetic dipole and quadrupole transition)and magnetic dipole transition of the Cu22+.The infrared spectral lines of the atoms and ions from deexcitation radiation are measured.With the 4 MeV 129Xe20+ions impacting on solid Cu surfsce,the X-rays are measured,such as,the magnetic dipole deexcitation radiation transition of Cu22+,the X-rays of the L1 edge transition and Lb3 of the Cu I,Lh and Lb3 X-rays of the Xe ions.The results show that during the neutrilization of highly charged Xe ions with lower energy above the Cu surface,the infrared lines are mainly from the deexcitation of the incident ions and the ionized or excited target atoms.The inc

关 键 词：高电荷态离子 电偶极禁戒跃迁 近红外光谱线 

分 类 号：O433[机械工程—光学工程]