[1] Chen Yuqing,Eichler H J, Macdonald R,Helical hollow cathode IR copper ion laser,Chinese Physics Laser,1989;16(5):306-308
[2] Grozeva M, Sabotinov N, Coil hollow cathode for mQtal vapour laser, Opt.Commun.,1982;41:57-58
[3] Koch H J, Cu Ⅱ laser with a helical hollow cathode discharge,J. Phys. E, 1983;16:122-123
[4] Eichler H J, Hamisch J,Macdonald R et al.,UV-Cu Ⅱ laser helical hollow cathodes, J.A.P,1987;61(5):2069
[5] Karoly Rozsa, Hollow cathode discharge for gas laser,Z.Natarforsch,1980, 35a, 649-664
[6] Tetsuo Iijima, He-Zn+ ion laser using hollow-cathode discharge with-high-voltage operation, Japan.J.A.P.,1982; 21(12); 1732-1735
[7] Nils Laegreid, Wehner G K,Sputtering yields of metals for Ar+ and Ne+ ions with energies from 50-600 eV,J. A. P.,1961s 32(3):365-369