Silver Behenate as a Standard for Instrumental Resolution and Wavelength Calibration for Small Angel Neutron Scattering

Soft x-ray scattering facility at the Advanced Light Source with real-time data processing and analysis

“…The analysis program fits the characteristic scattering rings from the chosen calibrant to determine the geometry of the sample and detector in the same procedure as in hard x-ray scattering calibration. 46 Various forms of data analysis are available, including radial integrations, sector integrations, line cuts, or some combination. After the data analysis mode is chosen and a dark image or series of dark images is acquired with the same exposure times of the data to be collected, the "auto analyzer" feature is turned on.…”

Wavelength calibration in conventional SANS setup with a mechanical velocity selector

“…The effective wavelength at different selector speeds was determined using a silver behenate powder sample. Silver behenate gives a strong reflection at -1 q = 0.1076 Å [6], which can be conveniently measured by a position sensitive detector within a wide range of wavelengths and sample-detector distances, making it suitable for wavelength and resolution calibrations of SANS instruments [6][7][8]. The experiments have been performed on the SANS instrument operating at a cold neutron beamline at the Budapest Research Reactor [9], equipped with a multidisk type velocity selector [10,11].…”

Tuning the instrument resolution using chopper and time of flight at the small-angle neutron scattering diffractometer KWS-2

“…As standards typically used for the calibration of the wavelength and wavelength spread in SANS, the following systems were tested: (a) SiO 2 particles in deuterated dimethylformamide (d-DMF) as size standards with a particle volume fraction of 0.2% and well known size and polydispersity (Vad et al, 2010); (b) silver behenate (AgBeh) as a wavelength and wavelength spread standard (Huang et al, 1993;Gilles et al, 2000;Okabe et al, 2007); (c) opal (Graetsch & Ibel, 1997) as a wavelength standard. Star-like micelles formed by newly synthesized C 28 H 57 -PEO5 diblock copolymers in water (Zinn et al, 2014) were for the first time investigated by SANS with variable wavelength resolution in order to scan the crystalline phases occurring over a wide polymer concentration range.…”

“…The wavelength calibration at KWS-2 is typically carried out using the Bragg reflections from silver behenate (AgBeh) powder (ARMAR Chemicals). The Bragg spacing of AgBeh is known to be d = 58.38 Å (Gilles et al, 2000;Okabe et al, 2007). AgBeh can also be used as reference material for determining the instrumental resolution parameters (Grillo, 2008) when Bragg peaks with several orders are observed at large angles (Q > 0.1 Å À1 ).…”