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14.5% near-normal incidence reflectance of Cr/Sc x-ray multilayer mirrors for the water window
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics.
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2003 (English)In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 28, no 24, 2494-2496 p.Article in journal (Refereed) Published
Abstract [en]

Cr/Sc multilayer mirrors, synthesized by ion-assisted magnetron sputter deposition, are proved to have a high near-normal reflectivity of R = 14.5% at a grazing angle of 87.5degrees measured at the wavelength A = 3.11 nm, which is an improvement of more than 31% compared with previously published results. Elastic recoil detection analyses show that the mirrors contained as much as 15 at. % of N and traces of C and O. Soft x-ray reflectivity simulations reveal interface widths of sigma = 0.34 nm and an exceptionally small layer thickness drift of similar to1.6 X 10(-5) nm/multilayer period throughout the stack. Simulations show that a reflectivity of R = 25.6% is attainable if impurities and layer thickness drift can be eliminated. The abrupt interfaces are achieved with ion assistance with a low ion energy of 24 eV and high ion-to-metal flux ratios of 7.1 and 23.1 during Cr and Se sputter deposition, respectively. In addition, a near-normal incidence reflectivity of 5.5% for the C VI emission line (lambda = 3.374 nm) from a laser plasma source was verified. (C) 2003 Optical Society of America.

Place, publisher, year, edition, pages
2003. Vol. 28, no 24, 2494-2496 p.
National Category
Engineering and Technology
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URN: urn:nbn:se:liu:diva-48449OAI: oai:DiVA.org:liu-48449DiVA: diva2:269345
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2017-12-12

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Eriksson, FredrikBirch, Jens

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