The potentialities of microwave spectrometer techniques in assessing the purity and crystalline quality of synthetic maser crystals are illustrated by a comparison of the paramagnetic properties of ruby samples grown from the vapour phase and from powder by flame fusion. Typical spectra presented are discussed in relation to complementary chemical and spectrographic analysis, and it is shown the information obtained is of direct relevance to the accurate control of methods of crystal growth.
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Thorp et al. (1961) studied this question.
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