LOCALIZED VIBRATIONAL MODES OF Li AND P IMPURITIES IN GERMANIUM

Abstract
Infrared absorption bands due to localized vibrational modes of impurities in germanium are observed at liquid‐nitrogen temperature. One pair of bands shows a Li isotope shift from frequencies of 356 cm−1 and 380 cm−1 with 7Li to 379 cm−1 and 405 cm−1 with 6Li; these are attributed to Li paired with Ga. Two bands are associated with the phosphorus: one, at 343 cm−1, is attributed to isolated substitutional phosphorus; the other, at 350 cm−1, is attributed to P–Ga pairs.