Local modes of boron in germanium have been observed by infrared absorption measurements in the range from 480 to 630 cm −1 at 195 and 295°K. Lithium has been used as a compensating donor impurity. The absorption spectrum contains three pairs of bands which are attributed to local modes of boron on the basis of the isotopic shifts observed. One of these pairs is associated with unpaired (isolated) boron and two others with boron in paired configuration (with lithium), as was predicted theoretically. A comparison of our data with those already known for silicon is given.
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Nazarewicz et al. (1969) studied this question.
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