Department of Applied Physics Xi'an Jiaotong University Xi'an 710049 China;
Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 China;
Department of Applied Physics Xi'an Jiaotong University Xi'an 710049 China;
Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 China;
Department of Applied Physics Xi'an Jiaotong University Xi'an 710049 China;
Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 China;
Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 China;
Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 China;
highly charged ion; hollow atom; characteristic spectrum; spectral intensity;