1. Much of this material may be found in greater detail inD. L. Dexter:Proceedings of the Photoconductivity Conference at Atlantic City, 1954 (New York, 1956), p. 155;H. Y. Fan, M. L. Shepherd andW. C. Spitzer:Proceedings of the Photoconductivity Conference at Atlantic City, 1954 (New York, 1956) p. 184;J. Bardeen, F. Blatt andL. Hall:Proceedings of the Photoconductivity Conference at Atlantic City, 1954 (New York, 1956), p. 146.
2. H. Y. Fan:Phys. Rev.,82, 900 (1951);H. M. James:Proceedings of the Photoconductivity Conference at Atlantic City, 1954 (New York, 1956), p. 204.
3. D. L. Dexter: reference [1], p. 181 and 617.
4. F. Seitz:Rev. Mod. Phys.,23, 328 (1951);R. M. Blakney andD. L. Dexter:Physical Society, « Defects in Crystalline Solids », Report of the 1954 Bristol Conference, p. 108;Phys. Rev.,96, 227 (1954).
5. A. Radkowsky:Phys. Rev.,73, 749 (1948).