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Light produced by a laser plasma light source (LPLS) is used to perform optical reflectivity measurements on single crystals from 5 to 40 eV in a single experiment. The intense continuum generated by the rare-earth plasma allows a significantly higher resolution above 15 eV and extends the measurements to higher energies than those attainable with other laboratory based light sources. This is the first application of a LPLS to vacuum ultraviolet spectroscopy of solids and we demonstrate this capability on two insulating materials, α-Al2O3 and MgAl2O4.
Bortz et al. (Mon,) studied this question.