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An optical absorption band at 9{μ} has been correlated with the oxygen content in silicon. Pulled silicon crystals were found to contain up to 10¹⁸ oxygen atoms per cm³ which seem to originate from the quartz crucible. The oxygen concentration in silicon crystals prepared by the floating zone technique in vacuum was found to be less than 10¹⁶ oxygen atoms per cm³. The 9{μ} absorption due to silicon-oxygen bond stretching vibrations provides a possibility for a quantitative oxygen analysis of high sensitivity. A corresponding absorption in germanium at 11.6{μ} is believed to be due to a germanium-oxygen vibration.
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Kaiser et al. (1956) studied this question.
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