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Evidence has been obtained of the mutual interaction of 9 GHz electromagnetic and elastic waves in a glass at 1.5 K. These experiments prove that some two-level systems (T.L.S.) have a double nature, an explanation of which is proposed. It has been found that the T.L.S. are electromagnetically saturated by a field higher than εc = 103 V m-1.
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Doussineau et al. (1977) studied this question.
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