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It is shown that exterior complex scaling provides for complete absorption ofoutgoing flux in numerical solutions of the time-dependent Schr\"odingerequation with strong infrared fields. This is demonstrated by computing highharmonic spectra and wave-function overlaps with the exact solution for aone-dimensional model system and by three-dimensional calculations for the Hatom and a Ne atom model. We lay out the key ingredients for correctimplementation and identify criteria for efficient discretization.

Exterior complex scaling as a perfect absorber in time-dependent problems