Low-Angle Synchrotron Radiation Diffraction with Glass-Capillary Optics

The use of borosilicate-glass-capillary optics at a chosen wavelength for low scattering has been explored using an undulator beam at the ESRF. With a 2.3 μm beam at 0.092 nm wavelength, a silver behenate powder sample was scanned in two dimensions with a 2 μm step width. Scattering from single crystallites with d₀₀₁ = 5.83 nm could be observed. The limit for observation, at low angles, was ca s ≃ 0.1 nm⁻¹ (s = 1/d for d ≃ 10 nm).