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Paramagnetic resonance studies of SiO 2 :Ge crystals X-irradiated in a microwave cavity at 4K show a dominant hole centre stable below 35K. It is suggested that the hole is stabilised in an oxygen 2p orbital by a nearby germanium atom and that germanium is an amphoteric impurity in quartz. The relevance of the measurements to the mobility of hole polarons in crystalline quartz is discussed.
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Hayes et al. (1985) studied this question.
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