Dynamic Two-Center Interference in High-Order Harmonic Generation from Molecules with Attosecond Nuclear Motion

Abstract

We report a new dynamic two-center interference effect in high-harmonic generation from ${\mathrm{H}}_2$, in which the attosecond nuclear motion of ${\mathrm{H}}_2^{+}$ initiated at ionization causes interference to be observed at lower harmonic orders than would be the case for static nuclei. To enable this measurement we utilize a recently developed technique for probing the attosecond nuclear dynamics of small molecules. The experimental results are reproduced by a theoretical analysis based upon the strong-field approximation which incorporates the temporally dependent two-center interference term.