title: A methodology for calibrating wavelength dependent spectral resolution for crystal spectrometers.
abstract: High quality absorption spectroscopy measurements were recently achieved at the Sandia National Laboratories Z facility in the soft x-ray range. Detailed spectral resolution knowledge is a key requirement for their interpretation. We present a methodology for measuring the wavelength dependent crystal spectral resolution, with a particular focus on the 7-17 Å range. We apply this procedure to the case of 1st order resolution of a potassium acid phthalate (KAP) convex crystal spectrometer. One calibration issue is that inferring the crystal resolution requires that the x-ray source emission feature widths and spectral profiles are known. To this aim, we resolve Manson x-ray source Si, Al, and Mg Kα line profiles using a KAP crystal spectrometer in 2nd order to achieve relatively high resolution. This information is exploited to measure 1st order KAP resolving powers λ∕Δλ∼1100-1300 in the 7-10 Å wavelength range.
authors.affiliation: Sandia National Laboratories, Albuquerque, New Mexico 87185, USA. gploise@sandia.gov
authors.forename: G
authors.initials: G
authors.lastname: Loisel
authors.forename: J E
authors.initials: JE
authors.lastname: Bailey
authors.forename: G A
authors.initials: GA
authors.lastname: Rochau
authors.forename: G S
authors.initials: GS
authors.lastname: Dunham
authors.forename: L B
authors.initials: LB
authors.lastname: Nielsen-Weber
authors.forename: C R
authors.initials: CR
authors.lastname: Ball