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Localized vibrational modes of impurities in gallium phosphide are observed in infrared absorption. Tentative assignments for the observed absorption bands are as follows: ωL=453 cm−1 is due to SiGa, 464 cm−1 to NP or OP 569 cm−1 to 11BGa, and 592 to 10BGa. Other defect bands are observed at 443, 527, and 606 cm−1. However, present experimental results are not sufficient to permit identification of the impurities.
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Spitzer et al. (1969) studied this question.
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