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Separating gerade and ungerade components of temporal transition dipole by floquet theorem

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Recently, odd-even high-order harmonic generation (HHG) emitted from asymmetric molecules has paid much attention since its application in extracting molecular structures and probing molecular dynamics. In which, the ratio of the even and odd harmonics in HHG spectra is an important quantity characterized the molecular asymmetry. This even-to-odd ratio has been explained by the gerade and ungerade components of the temporal transition dipole. Though, the separating procedure of the temporal transition dipole has not been published in the previous study. In this paper, we present the detailed procedure of separating the gerade and ungerade components of the temporal transition dipole using the Floquet theorem. Besides, we explain the correlation between the intensities of even and odd harmonics by the new approach, using the induced dipole acceleration. | Separating gerade and ungerade components of temporal transition dipole by floquet theorem