THE deeply tinted varieties of quartz, such as “smoky” quartz and the yellow or Madagascar variety, are generally transparent in the infra-red region of the spectrum to the same extent as clear ...
Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences, Vol. 231, No. 1186 (Sep. 6, 1955), pp. 404-414 (11 pages) A model is proposed to account for the properties of ...
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