Abstract
AbstractOptical absorption and emission spectra have been studied in LiF crystals containing oxygen, hydroxyl and metal impurities, and coloured with γ ‐rays at room temperature with doses up to 83 kGy. Well‐defined bands in absorption and emission spectra of uncoloured samples have been attributed to impurities. Colouring of the same crystals adds new spectroscopic features, which are related to various colour centres, but at the same time depends strongly on the impurity content, especially as far as their formation efficiency is concerned. The connection between impurities and colour centres will be discussed on the basis of optical spectra of uncoloured and coloured, and also pre‐annealed and bleached crystals. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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