Abstract
We calculate the infrared absorption of large polarons bound to defects in the weak coupling limit. Polar crystals with more than one longitudinal optical phonon branch coupled to the electrons are considered. Oscillator strengths corresponding to defect transitions without phonons and to transitions with emission of phonons are calculated using the Larsen wave-functions. The results are applied to infrared data in strontium titanate and it is found that weak coupling calculations are in better agreement than strong coupling ones.
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