Ar polycrystals grown for VUV laser applications show an increase of the luminescence efficiency with grain size by a factor of two. Mean grain sizes between 0.05 and 0.7 mm due to different growing conditions are identified by X-ray diffraction. The crystals have good optical quality and are highly transparent from 1000 nm down to 110 nm.
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Rudnick et al. (1985) studied this question.
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