An optical extinction band in colored CsBr at 1050 mμ is attributed to colloidal cesium precipitates. The peak wavelength may be closely predicted by assuming the extinction is due to a plasma resonance of conduction electrons in the cesium particles. The band is relatively insensitive to temperature change. The bandwidth decreases as the particle size increases. The shape of the extinction curve is distorted at low temperatures, indicating a distortion of the particle shape. The band resists bleaching.
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Richard E. Jensen (1963) studied this question.
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