Abstract
Sodium, potassium, rubidium and cesium azides X-irradiated at liquid nitrogen temperature develop F bands, other absorption bands at longer wavelength, ascribed to electron surplus centres, and V bands in the ultraviolet. At room temperature, sodium azide gives a broad band in the ultraviolet ascribed to photoemission by sodium metal; potassium develops two bands in the red ascribed to R centres. Cesium and rubidium azides develop broad structured bands in the ultraviolet of undetermined origin.
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