Abstract
IN the Zeitschrift für Physik of June 29, B. Gudden and R. Pohl describe additional work done by them on crystal conductivity. Crystals are divided into two groups: (i) those with optical dispersion pointing to considerable mobility of the electrons, and having, in the region of transparency, a refractive index greater than two; (2) those in which photoelectric action takes place only when impurities are present, which may exist as single molecules or as colloidal particles; examples of this are blue or green fluor spar, quartz as yellow citrine or violet amethyst, rock salt. Group (i) is divided into two sub-groups: (a) the active absorption of light takes place only in the “ground “material (diamond, zinc blende, sulphur, selenium, etc.); in (b) it takes place partly in the ground material and partly in the impurities (alkaline earths and zinc sulphide with centres of phosphorescence).
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Photoelectric Conductivity of Crystals. Nature 113, 254 (1924). https://doi.org/10.1038/113254b0
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DOI: https://doi.org/10.1038/113254b0