[1] [1] Becker K H, Schoenbach K H, Eden J G, et al. J. Phys. D: Appl. Phys., 2006, 39: R55.

[3] [3] Kothnur P S, Raja L L. J. Appl. Phys., 2005, 97(4): 043305.

[4] [4] Kurunczi P, Shah H, Becker K. J. Phys. B: At. Mol. Opt. Phys., 1999, 32: L651.

[5] [5] Schoenbach K H, Moselhy M, Shi W. Plasma Sources Sci. Technol., 2004, 13: 177.

[6] [6] Schoenbach K H, Verhappen R, Tessnow T, et al. Appl. Phys. Lett., 1996, 68(1): 13.

[8] [8] Shi W H, Stark R H, Schoenbach K H. IEEE Trans. Plasma. Sci., 1999, 27(1): 16.

[9] [9] Ahmed E H, Shi W H, Moselhy M, et al. J. Appl. Phys., 2000, 88(6): 3220.

[10] [10] Kucukarpaci H N, Lucas J. J. Phys. D: Appl. Phys., 1981, 14: 2001.

[11] [11] Konjevic R, Konjevic N. Spectrochimica Acta Part B, 1997, 52: 2077.

[12] [12] Griem H R. Plasma Spectroscopy. New York: McGraw-Hill, 1964. 492.