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Transmittance and optical constants of Ho films in the 3-1340 eV spectral range

AuthorsFernández Perea, Mónica; Larruquert, Juan Ignacio ; Aznárez, José Antonio ; Méndez, José Antonio ; Poletto, L.; Frassetto, F.; Malvezzi, A.M.; Bajoni, D.; Giglia, A.; Mahne, N.; Nannarone, S.
Issue Date2011
PublisherAmerican Institute of Physics
CitationJournal of Applied Physics 109: 083525 (2011)
AbstractThe optical constants n and k of holmium (Ho) films were obtained in the 3-1340-eV range from transmittance measurements performed at room temperature. Thin films of Ho with various thicknesses were deposited by evaporation in ultra high vacuum conditions and their transmittance was measured in situ. Ho films were deposited onto thin C-film substrates supported on high transmittance grids. Transmittance measurements were used to obtain the extinction coefficient k of Ho films. The refractive index n of Ho was calculated with Kramers-Krönig analysis; in order to do this, k data were extrapolated both on the high and on the low energy parts of the spectrum by using experimental and calculated k values available in the literature. Ho, similar to other lanthanides, has a low-absorption band below the O2,3 edge onset; the lowest absorption was measured at ∼22 eV. Therefore, Ho is a promising material for filters and multilayer coatings in the energy range below the O2,3 edge in which most materials have a large absorption. Good consistency of the data resulted from the application of f and inertial sum rules. © 2011 American Institute of Physics.
Identifiersdoi: 10.1063/1.3556451
issn: 0021-8979
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