An experimental study of thallous sulfide photohyphen;conductive cells is presented. It includes an investigation of the sensitizing oxidation reaction; cell characteristics as function of voltage, temperature, light intensity, wavehyphen;length, modulating frequency, and composition; measurements of thermoeffect and optical absorption; xhyphen;ray and electron diffraction studies, and an examination of the photohyphen;response to light flashes of very short duration. A theoretical discussion will be given as Part II in a subsequent paper.
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