It was found experimentally with increasing the laser ellipticity that the intensity of the 45th order harmonic from O₂ decreases slower than that from N₂. The difference is attributed to the fact that the recombination probability is suppressed for O₂ but enhanced for N₂ in a linearly polarized field. Simulation results obtained by extending the Lewenstein model to molecules agreed qualitatively with the experimental discoveries.
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Shan et al. (2004) studied this question.
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