Abstract

A seeding gas jet including Xe clusters was irradiated with a laser-driven plasma soft x-ray laser pulse (λ=13.9 nm, ∼7 ps, ≤5×109 W/cm2), where the laser photon energy is high enough to ionize 4d core electrons. In order to clarify how the innershell ionization followed by the Auger electron emission is affected under the intense laser irradiation, the electron energy distribution was measured. Photoelectron spectra showed that the peak position attributed to 4d hole shifted to lower energy and the spectral width was broadened with increasing cluster size. Moreover, the energy distribution exhibited that a strongly coupled cluster nanoplasma with several eV was generated.

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