  A strongly asymmetric, Fano-like resonance profile has been found for
magneto-absorption in the states of hot free electron-hole pairs scattered by
defects in bulk semiconductors. The renormalization of the absorption profile,
compared to that expected from the bare density of states in a high magnetic
field, follows from a quasi-one-dimensional character of electronic
excitations. The results are valid for absorption by the electronic states of
large Landau quantum number where the Coulomb interaction should play a minor
role. The resonance shape is in a good qualitattive agreement with experimental
observations.
