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3. see e.g. D.A. Copeland, N.R. Kestner, J. Jortner: J. Chem. Phys. 53, 1189 (1970)
4. see e.g. W.L. Jolly: Metal-Ammonia Solutions, Stroudsburg, Pennsylvania: Dowden, Hutchinson, and Ross, Inc. 1972; Electrons in Fluids, ed. by J. Jortner, N.R. Kestner, Springer, Berlin (1973); J.C. Thompson: Electrons in Liquid Ammonia, Oxford Univ. Press, Oxford, (1976)
5. H. Haberland, H.G. Schindler, D.R. Worsnop: Ber. Bunsenges. Phys. Chem. 88, 270 (1984)