Abstract
Wavelength and intensity dependencies of laser-induced electron and positive ion emission from a BaF2 (111) surface were studied in the MW/cm2 intensity range, well below the damage threshold. In the range 500 to 560 nm we find similar shapes for the spectral emission yields of electrons and ions. Electrons are emitted by two- and five-photon absorption below and above 1.5 MW/cm2, respectively. In contrast, ion desorption involves a ten-photon process, suggesting that two holes in the valence band are required. The interpretation of the data is supported by molecular cluster calculations. In the blue spectral range at higher intensities (∼50 MW/cm2) we observe rapid bleaching of the irradiated spots and evidence for layer-by-layer ablation.
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