title: A versatile medium-resolution x-ray emission spectrometer for diamond anvil cell applications.
abstract: We present design and performance details for a polycapillary-coupled x-ray spectrometer that provides very high collection efficiency at a moderate energy resolution suitable for many studies of nonresonant x-ray emission spectroscopy, especially for samples of heavy elements under high pressures. Using a single Bragg analyzer operating close to backscattering geometry so as to minimize the effect of the weak divergence of the quasicollimated exit beam from the polycapillary optic, this instrument can maintain a typical energy resolution of 5 eV over photon energies from 5 keV to 10 keV. We find dramatically improved count rates as compared to a traditional higher-resolution instrument based on a single spherically bent crystal analyzer.
authors.affiliation: Physics Department, University of Washington, Seattle, Washington 98195-1560, USA.
authors.forename: D R
authors.initials: DR
authors.lastname: Mortensen
authors.forename: G T
authors.initials: GT
authors.lastname: Seidler
authors.forename: J A
authors.initials: JA
authors.lastname: Bradley
authors.forename: M J
authors.initials: MJ
authors.lastname: Lipp
authors.forename: W J
authors.initials: WJ
authors.lastname: Evans
authors.forename: P
authors.initials: P
authors.lastname: Chow
authors.forename: Y-M
authors.initials: YM
authors.lastname: Xiao
authors.forename: G
authors.initials: G
authors.lastname: Boman
authors.forename: M E
authors.initials: ME
authors.lastname: Bowden