Abstract

We study the electron-nuclear coupled dynamics for oriented ${\mathrm{HeH}}^{+}$ molecules in strong laser fields numerically and analytically. At small orientation angles, the asymmetric molecule tends to stretch to distances larger than the equilibrium separation and strong even harmonics are emitted. We show that the permanent dipole of the system plays an important role in the vibrational dynamics of the nuclear wave packet. The nuclear motion and the molecular structure can be read from the spectra and ellipticity of odd-even high harmonics. Our results also have implications for strong-field ionization of the asymmetric system.

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