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.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.