title: Experimental comparison of extreme-ultraviolet multilayers for solar physics.
abstract: We compare the reflectance and stability of multilayers comprising either Si/Mo, Si/Mo2C, Si/B4C, Si/C, or Si/SiC bilayers, designed for use as extreme-ultraviolet (EUV) reflective coatings. The films were deposited by using magnetron sputtering and characterized by both x-ray and EUV reflectometry. We find that the new Si/SiC multilayer offers the greatest spectral selectivity at the longer wavelengths, as well as the greatest thermal stability. We also describe the optimization of multilayers designed for the Solar-B EIS instrument. Finally, we compare experimental reflectance data with calculations and conclude that currently available optical constants cannot be used to adequately model the performance of many of these multilayers.
authors.affiliation: Columbia Astrophysics Laboratory, 550 West 120th Street, New York, New York 10027, USA. windt@astro.columbia.edu
authors.forename: David L
authors.initials: DL
authors.lastname: Windt
authors.forename: Soizik
authors.initials: S
authors.lastname: Donguy
authors.forename: John
authors.initials: J
authors.lastname: Seely
authors.forename: Benjawan
authors.initials: B
authors.lastname: Kjornrattanawanich