Abstract
Diamond formation in hydrogenated amorphous-carbon films containing ultradisperse copper has been studied by measuring IR absorption at two-phonon diamond frequencies. The anomalously high two-phonon absorption observed in the experiments has permitted improving the sensitivity of the method. Mechanisms of the two-phonon absorption enhancement are discussed in terms of the theory of a medium containing nanosized copper-doped graphite fragments. It is shown that the observed enhancement of two-phonon absorption is caused by electrical induction of the local fields induced by irradiation in diamond nanocrystals acting on adjoining copper-doped graphite fragments.
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