Accession Number : AD0600226

Title :   THE PHOTO EFFECT IN COLLOIDAL METAL PARTICLES,

Corporate Author : ARMY ENGINEER RESEARCH AND DEVELOPMENT LABS FORT BELVOIR VA

Personal Author(s) : Dykman,I. M.

Report Date : 1964

Pagination or Media Count : 12

Abstract : The conclusion was drawn that the photo effect is uniquely dependent on the frequency of the light and the size of the object. This dependence is qualitatively different from the characteristics of massive metal cathodes. The reason for this is not hard to find. The absorption of light of a given frequency by the conduction electrons of the metal depends to a considerable extent on the position of the starting energy level. A small change in the latter is sufficient to produce a sharp variation in the probability of absorption of the light. In spite of the fact that an increase in the size of the irradiated objective is accompanied by an increase in the number of levels, their position may be such that none conditions a significant absorption of light, and hence a significant photocurrent, at the given frequency. Conversely, if the object is small, there may be only a single level from which light of the given frequency can transfer electrons to the continuous spectrum, but the probability of such a process may be quite high. (Author)

Descriptors :   (*PHOTOELECTRIC EFFECT, METALS), (*METALS, PHOTOELECTRIC EFFECT), CATHODES, ATOMIC ENERGY LEVELS, PARTICLES, COLLOIDS, METAL FILMS, ELECTRONS, ABSORPTION, USSR

Distribution Statement : APPROVED FOR PUBLIC RELEASE