AI Article Synopsis
- The study uses the intensity-difference spectrum technique to analyze ion energy spectra from Coulomb explosions of small argon clusters with precise laser intensity conditions.
- It finds that reducing laser intensity causes the emergence of low energy cuts in ion yields, which aren't seen at higher intensities.
- The research reveals a shift from surface-driven expansion at lower electron temperatures to a volume-driven Coulomb explosion as laser intensity increases, influenced by factors like ionization and recombination.
Article Abstract
The intensity-difference spectrum technique is applied to record charge-state resolved ion energy spectra from the Coulomb explosion of small Ar clusters under well-resolved laser intensity conditions. The far-reaching control of the experimental parameters permits us to identify a striking change in the expansion pattern of the nanoplasma beyond a given intensity. The simultaneous characterization of ion charge state and energy uncovers that a reduction of the laser intensity leads to a development of low energy cuts in the ion yields, not present at higher fluence. The complex interplay of outer ionization, recombination, ion screening, and the phenomenon of ionization saturation favors a surface-driven expansion at low plasma electron temperatures. With increasing laser intensity a transition into a volume-driven Coulomb explosion is observed.
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| http://dx.doi.org/10.1103/PhysRevLett.133.073202 | DOI Listing |
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