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The relative strengths of harmonic intensities, generated in xenon by a strong infrared laser, are calculated from the time-dependent dynamics of the electronic charge density. The (nonperturbative) solution of the time-dependent Schr\"odinger equation for a single-electron model of the atomic system is found to predict line strengths in reasonable agreement with the observed intensities. A single time-dependent calculation provides the intensity predictions for all orders for a given laser wavelength and intensity.
Kulander et al. (Mon,) studied this question.