Optical Properties of the Alkali Metals

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Abstract
The physical processes responsible for the unique optical properties of silver, in contrast to those of the alkali metals are briefly discussed from the standpoint of the zone theory of electron distribution in crystals. The results of experiments undertaken in the hope of finding a renewal of reflecting power in the remote ultraviolet in the case of the alkali metals, are recorded. Photographs of the spectra of the discharge of a condenser through a capillary tube after reflection from metal films condensed at liquid-air temperature showed no return of reflection in the region extending down to 500A.

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