I14 Control room:
Tel: +44 (0) 1235 778570
Principal Beamline Scientist:
Tel: +44 (0)1235 778583
The Hard X-ray nanoprobe beamline is a dedicated facility for nanoscale microscopy and welcomed first users in March 2017. The nanoprobe provides a flexible endstation, with a beam size of 50 nm, optimised for scanning X-ray fluorescence, X-ray spectroscopy and diffraction. To maximise the distance from the focusing optic to the sample, the beamline extends beyond the main building to a distance of approximately 185m, and is housed in an external building alongside the eBIC and ePSIC national electron microscopy facilties.
2D elemental mapping at 50 nm spatial resolution provides information on the chemical composition and elemental distribution in the sample. Additional information can be obtained by simultaneously acquiring imaging data.
Spatially-resolved X-ray Absorption Near-Edge Structure provides information on the chemical speciation of the element of choice.
Multivariate cluster anaylsis revealing statistically-similar regions acording to their XANES spectra, can be performed by the cross-platform python package - Mantis.
Speciation maps can be calculated through fitting the absorption data from each pixel to the linear combination of the standard spectra, representing the ratio between the expected species (Gomez-Gonzalez et al. 2019 - ACS Nano, 2019, 13, 11049–11061).
X-ray diffraction (XRD) can be used to spatially map changes in crystallographic direction, d-spacing or strain across a sample. A 2D XRD pattern is collected per pixel, in concert with the XRF signal. Processing in 1D or 2D is later achieved through DAWN.
At I14, XRD mapping is available in both wide- and small- angle scattering geometry. The q range available is ~1-3 A for WAXS.
X-ray ptychography imaging, which is a scanning coherent diffractive imaging technique, is now available at i14.
PtyREX, the reconstruction package for electrons and X-rays, was used for the processing and analysis of the ptychographic data. Each channel from the MERLIN detector was processed individually through 100 iterations of ePIE, with position correction and up-sampling.
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