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The double-slit interference in single-photon ionization of the diatomicmolecular ion $\mathrm{H}_2^+$ is theoretically studied beyond the dipoleapproximation. Via simulating and comparing the interactions of the prealigned$\mathrm{H}_2^+$ and the hydrogen atom with the xuv pulses propagating indifferent directions, we illustrate two kinds of effects that are encoded inthe interference patterns of the photoelectrons from $\mathrm{H}_2^+$: (i) thephoton-momentum transfer and (ii) the finite speed of light. While both effectscould modify the maxima of the interference fringes, we show that the formerone hardly affects the interference minima. Our results and analysis show thatthe interference minima rule out the influences of the photon-momentum transferand, potentially, the multielectron effect, thus performing a better role indecoding the zeptosecond time delay for the pulse hitting one and the otheratomic centers of the molecule.

Nondipole effects on the double-slit interference in molecular ionization by xuv pulses