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Abstract
The absorption coefficient of silicon at 1118 cm−1 due to the multiphonon contribution related to the combination of two transverse optical and one transverse acoustical phonons is measured at the liquid He temperature. The precise knowledge of this contribution, usually hidden by the absorption band of the unavoidable oxygen impurities, permits the quantitative measurement of interstitial oxygen concentration down to 3×1014 atoms/cm3.
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