1 Sigmund, F., Sputtering by Particle Bombardment I, Ed. Behrisch, R., Sprlnger-Verlag, Berlin, 1981, p. 60．
[2]
2 Coburn, J. W., J. Vac. Sci. Technol., 13(1976) , 1037．
[3]
3 Braun, P.; Farber, W., Surf. Sci., 47(1975) , 57．
[4]
4 Okutani, T.; Shikata, M.; Shimizu, R., Surf. Sci., 99(1980) , 1410．
[5]
5 Frankenthal, R. P.; Siconolfi, D. L., ibid., 104(1981) , 205．
[6]
6 Zalar, A., Proc. of the 4th Int. Conf. on Solid Surface and the 3rd Europ. Conf. on Surface Science, Eds. Degras, D. A.; Costa, M., Supplement a la Revue, "Le Vide, les Couches Minces" n°201, 1980, p. 1311．
[7]
7 Mathieu, H. I.; Landolt, D., Surf. Sci., 53 (1975) , 228．
9 Slusser, G. I.; Winnograd, N., ibid., 84(1979) , 211．
[10]
10 Betz, G. Opitz, M.; Braun, P., Nucl. Instrum. Methods, 182/183(1981) , 63．
[11]
11 Mathieu, H. J.; Landolt, D., Proc. of the 4th Int. Conf. on Solid Surface and the 3rd Europ. Conf. on Surface Science, Eds. Degras, D. A.; Costa, M., Supplement a la Revue, "Le Vide, les Couches Minces" n°201, 1980, p. 1319．
[12]
12 Kuijers, F. J.; Pones, V., J. Catal., 60 (1979) , 100．
[13]
13 Shimizu, M.; Ono, M.; Nakayama, K., Surf. Sci., 36(1973) , 817．
[14]
14 West, L. A., J. Vac. Sci. Technol., 13(1976) , 198．
[15]
15 Oechsner, H., Z. Phys., 238(1970) , 433．
[16]
16 Penn, D. R., J. Electron Spectrosc. Relat. Phenom., 9(1976) , 29．
