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

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

2008-01-08

arxiv.org/abs/0801.1139v1

Physics

Atomic Physics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevA.77.030703

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

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