Soft X-ray absorption spectroscopy and microscopy
A table-top plasma source combined with a soft x-ray spectrometer is being used for analysis of the near-edge x-ray absorption fine structure (NEXAFS) of thin samples (e.g. C, N, O, Ca, K, Ti, Mn, Fe) within the “water window”, ranging from λ = 2.2 nm ... 4.4 nm. The fine structure of the absorption edges yields information on molecular orbitals, oxidation states and the coordination of an absorbing element, and can therefore be applied for chemical analysis.
Additionally, in the department Optics / Short Wavelengths a compact laboratory x-ray microscope is developed for the “water window” spectral range (λ = 2.2 nm … 4.4 nm) achieving a spatial resolution of about 50 nm. Applications range from structural analysis in biology and life sciences.
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