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Article Abstract
We experimentally studied the three-body fragmentation dynamics of a noble gas cluster (ArKr) upon its multiple ionization by an intense femtosecond laser pulse. The three-dimensional momentum vectors of correlated fragmental ions were measured in coincidence for each fragmentation event. A novel comet-like structure was observed in the Newton diagram of the quadruple-ionization-induced breakup channel of ArKr → Ar + Kr + Kr. The concentrated head part of the structure mainly originates from the direct Coulomb explosion process, while the broader tail part of the structure stems from a three-body fragmentation process involving electron transfer between the distant Kr and Kr ion fragments. Due to the field-driven electron transfer, the Coulomb repulsive force of the Kr and Kr ions with respect to the Ar ion undergoes exchange, leading to changes in the ion emission geometry in the Newton plot. An energy sharing among the separating Kr and Kr entities was observed. Our study indicates a promising approach for investigating the strong-field-driven intersystem electron transfer dynamics by using the Coulomb explosion imaging of an isosceles triangle van der Waals cluster system.
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| http://dx.doi.org/10.1063/5.0134833 | DOI Listing |
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