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Above 54.4 eV, two-photon double ionization of helium is dominated by asequential absorption process, producing characteristic behavior in the singleand triple differential cross sections. We show that the signature of thisprocess is visible in the nuclear recoil cross section, integrated over allenergy sharings of the ejected electrons, even below the threshold for thesequential process. Since nuclear recoil momentum imaging does not requirecoincident photoelectron measurement, the predicted images present a viabletarget for future experiments with new short-pulse VUV and soft X-ray sources.

Decoding sequential vs non-sequential two-photon double ionization of helium using nuclear recoil