1. Fujishima, A., and Honda, K., Nature, 238, 37–38 (1972).
2. Anderson, W. W., and Chai, Y. G., Energy Conversion (in the press).
3. Möllers, F., Tolle, H. J., and Memming, R., J. electrochem. Soc., 121, 1160–1167 (1974).
4. Gerisher, H., in Physical Chemistry, An Advanced Treatise, IX A (edit by Eyring, Henderson, and Jost), 463–542 (Academic, New York, 1970).
5. Wrighton, M. S., Ginley, D. S., Wolczanski, P. T., Ellis, A. B., Morse, D. L., and Linz, A., Proc. natn. Acad. Sci. U.S.A. (in the press).