Diatomic molecule in a strong infrared laser field: level-shifts and bond-length change due to laser-dressed Morse potential

Abstract

We present a general mathematical procedure to handle interactions described by a Morse potential in the presence of a strong harmonic excitation. We account for permanent and field-induced terms and their gradients in the dipole moment function, and we derive analytic formulae for the bond-length change and for the shifted energy eigenvalues of the vibrations, by using the Kramers-Henneberger frame. We apply these results to the important cases of ${\mathrm{H}}_2$ and $\mathrm{LiH}$, driven by a near- or mid-infrared laser in the $10^{13}$ $W/c{\mathrm{m}}^2$ intensity range.

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