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Absorption spectra of silica glasses implanted by Ni negative-ions of 60 keV to 3.8x10 16 ions/cm 2 were studied with excluding incoherent multiple reflection (ICMR) due to substrates. Two absorption peaks of 3.3 and 6.0 eV due to Ni nanoparticles were observed. To our knowledge, this is the first direct observation of the 6.0 eV peak which was usually smeared by ICMR. A next...
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