2024-03-28T17:50:07Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/590802016-02-17T11:22:52Zcom_10261_93com_10261_4col_10261_346
Transmittance and optical constants of Ho films in the 3-1340 eV spectral range
Fernández Perea, Mónica
Larruquert, Juan Ignacio
Aznárez, José Antonio
Méndez, José Antonio
Poletto, L.
Frassetto, F.
Malvezzi, A. Marco
Bajoni, D.
Giglia, A.
Mahne, N.
Nannarone, S.
The 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.
This work was also supported by the National Programme for Space Research, Subdireccio´n General de Proyectos de Investigacio´n, Ministerio de Ciencia y Tecnologı´a, project numbers AYA2008-06423- C03-02/ESP, AYA2009-14070, and AYA2010-22032.
Peer Reviewed
2012-10-29T11:38:09Z
2012-10-29T11:38:09Z
2011
2012-10-29T11:38:09Z
artículo
http://purl.org/coar/resource_type/c_6501
doi: 10.1063/1.3556451
issn: 0021-8979
Journal of Applied Physics 109: 083525 (2011)
http://hdl.handle.net/10261/59080
10.1063/1.3556451
en
open
American Institute of Physics