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We provide a new spectroscopic criterion for the observation of the insulator-metal transition in a two-component system, which is based on the disappearance of Wannier exciton states in the metallic region. This effect has been observed in the vacuum-ultraviolet spectra of mercury/xenon mixtures deposited at 10-30^∘{}K, where the Xe Wannier states are abruptly washed out at (55±{}5)% of Hg.
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Raz et al. (1972) studied this question.
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