Abstract
We have investigated the effect of exposure to thermal Sn atoms on the 13.5-nm specular reflectivity of single-layer Pd mirror surfaces. The mirror surfaces were characterized using low-energy ion scattering spectroscopy (LEISS) and the relative 13.5-nm specular reflectivity measured in situ during exposure to doses up to several 1016 cm-2 Sn particles. The relative reflectivity loss at 13.5 nm is found to deviate from the theoretical Fresnel reflectivity. Losses are < 20% for fluence levels > 1016 cm-2. The difference is due to deposited Sn nucleating at early stages of exposure and coalescing to nanoscale islands. Sn atomic surface fraction from LEISS reaches 50 a/o (atomic percent) at a fluence of 0.25×1016 cm-2 and ultimately levels off at 93–95% for fluences greater than 2.0×1016 cm-2. The specular reflectivity approaches the Fresnel theoretical value of 38.7% for thermal Sn deposition at large doses and equilibrates to 36.4%. The difference is mainly due to surface roughness of the deposited Sn film.
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61.18.Bn; 79.20.Rf; 78.70.Ck; 78.67.Bf
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Allain, J., Nieto, M. & Hassanein, A. Specular reflectivity of 13.5-nm light from Sn islands deposited on grazing incidence mirror surfaces. Appl. Phys. A 91, 13–16 (2008). https://doi.org/10.1007/s00339-008-4409-2
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DOI: https://doi.org/10.1007/s00339-008-4409-2