1. a)A.I. L. Efros and A. L. Efros, Fiz. Tekh. Poluprovodn., 16(1982)1209; Sov. Phys. Semicond., 16(1982)772; b) A.I. Ekimov and A.A. Onushchenko, Zh. Eksp. Teor. Fiz., 40(1984)337; JETP Lett., 40(1984)1136.
2. M.L. Steigerwald and L. E. Brus, Acc. Chem. Res., 23(1990)183.
3. A. Henglein, Topics in Current Chemistry, 143(1988)113.
4. Y. Wang and N. Herron, J. Phys. Chem., to be published.
5. Y. Wang, N. Herron, W. Mahler, and A. Suna, J. Opt. Soc. Am. B., 6(1989)808.