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Correction of EELS dispersion non-uniformities for improved chemical shift analysis
Rwh Webster1, A J Craven1, B Schaffer2
1SUPA, School of Physics & Astronomy, The University of Glasgow, Glasgow G12 8QQ, UK.
Abstract:
We outline a simple routine to correct for non-uniformities in the energy dispersion of a post-column electron energy-loss spectrometer for use in scanning transmission electron microscopy. We directly measure the dispersion and its variations by sweeping a spectral feature across the full camera to produce a calibration that can be used to linearize datasets post-acquisition, without the need for reference materials. The improvements are illustrated using core excitation electron energy-loss spectroscopy (EELS) spectra collected from NiO and diamond samples. The calibration is rapid and will be of use in all EELS analysis, particularly in assessments of the chemical states of materials via the chemical shift of core-loss excitations.
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