Abstract
In this work we report on a study of the plasmas produced in laser ablation of copper targets by XeF ( λ=351 nm) excimer laser irradiation. The kinetic energy of positive ions was measured by energy resolved time of flight mass spectrometry. Average kinetic energies of the Cu + ions of the order of 1–30 eV were observed, as a function of the laser pulse fluence. The experimental kinetic energy distributions show a double-peak structure. The first located at very low kinetic energy (∼1 eV) can be related to a thermoionic component, whereas the second is strongly dependent on laser fluence.
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