title: Nearly perfect large-area quartz: 4 meV resolution for 10 keV photons over 10 cm(2).
abstract: The perfection of two commercial top-grade quartz crystal wafers has been investigated using Bragg reflection at theta(B)=89.77 degrees of a 2.0 meV bandwidth beam of 9.979 keV X-rays by the (7\bar4\bar34) lattice planes. Topographic images show small defect concentrations (<or=5 cm(-2)). Energy scan widths are below 3 meV over 8 mm x 8 mm areas and 4 meV over the whole wafer ( approximately 11 cm(2)). This suggests that quartz can be a useful optical material.
authors.affiliation: SPring-8/JASRI, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan. sutter@spring8.or.jp
authors.forename: John P
authors.initials: JP
authors.lastname: Sutter
authors.forename: Alfred Q R
authors.initials: AQ
authors.lastname: Baron
authors.forename: Daigo
authors.initials: D
authors.lastname: Miwa
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Nishino
authors.forename: Kenji
authors.initials: K
authors.lastname: Tamasaku
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Ishikawa