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The recollision model of harmonic generation in a time-varying field has two elements: the emission due to a recolliding wave packet, and the quasiperiodic emission of wave packets in successive cycles. By discussing these issues separately, we explain the origin of blueshifting, and the ``smearing'' of the harmonic spectrum. We find that such a model shares many of the qualitative features of the semiclassical theories of harmonic generation.
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Watson et al. (1997) studied this question.
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