Department of Physics Dalian University;
Dalian;
China 116622 State Key Lab. of Materials Modification by Laser;
Electron and Ion Beams Department of Physics;
Dalian University of Technology;
Dalian 116024;
China;
State Key Lab. of Materials Modification by Laser Electron and Ion Beams Department of Physics;
Dalian University of Technology;
Dalian 116024;
China;