Ptychography is an imaging technique that combines scanning microscopy and coherent diffractive imaging, and is considered today a very promising technique to reach the limits of resolution and sensitivity in X-ray imaging. By measuring 2D ptychograms at different sample orientations the technique can be extended to 3D, i.e. ptychographic X-ray computed tomography (PXCT). While for X-rays we are still far from atomic resolution, X-ray energy resonance offers an alternative way to obtain information about atomic and chemical properties of the sample. I will discuss methods developed in that direction at the Swiss Light Source. With particular applications using X-ray magnetic circular dichroism (XMCD) to map magnetization textures in 3D, and with X-ray spectroscopy for nanoscale 3D chemical characterization of VPO catalyst materials.
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