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We report calculations of oscillator strengths for the far infraredabsorption of light by the excitonic complexes Xn- (the excess charge, n,ranging from one to four) confined in quantum dots. The magnetic field isvaried in an interval which corresponds to ``filling factors'' between 2 and3/5. Electron-hole interaction effects are seen in the deviations of the peakpositions from the Kohn lines, and in the spreading of the oscillator strengthsover a few final states. Transition densities are used as an additional tool tocharacterize the absorption peaks.Comment: Presented as a poster in the Third Stig Lundqvist Conference on  Advancing Frontiers of Condensed Matter Physics: Fundamental Interactions and  Excitations in Confined Systems, Trieste, August 11 - 1

Internal transitions of negatively charged magnetoexcitons in quantum dots