title: Femtosecond high-resolution hard X-ray spectroscopy using reflection zone plates.
abstract: An off-axis total external reflection zone plate is applied to wavelength-dispersive X-ray spectrometry in the range from 7.8 keV to 9.0 keV. The resolving power E/ΔE of up to 1.1 × 10(2), demonstrated in a synchrotron proof-of-concept experiment, competes well with existing energy-dispersive instruments in this spectral range. In conjunction with the detection efficiency of (2.2 ± 0.6)%, providing a fairly constant count rate across the 1.2 keV band, the temporal pulse elongation to no more than 1.5 × 10(-15) s opens the door to wide-range, ultra-fast hard X-ray spectroscopy at free-electron lasers (FELs).
authors.forename: Heike
authors.initials: H
authors.lastname: Löchel
authors.forename: Christoph
authors.initials: C
authors.lastname: Braig
authors.forename: Maria
authors.initials: M
authors.lastname: Brzhezinskaya
authors.forename: Frank
authors.initials: F
authors.lastname: Siewert
authors.forename: Peter
authors.initials: P
authors.lastname: Baumgärtel
authors.forename: Alexander
authors.initials: A
authors.lastname: Firsov
authors.forename: Alexei
authors.initials: A
authors.lastname: Erko