| Abstract | Momentum-resolved electron energy loss spectroscopy (qEELS) in the optical and x-ray region, 1 to 10 eV, yields dispersion relations (ω-q) of the observed excitations. The ω-q relations assists identification of spectral features qEELS spectra. Accurate calibration of energy dispersion in eV/pixel can be routinely obtained by several methods. However, reliable calibration of the momentum (q) dispersion at a camera length L = 10 to 100 m, that is used for valence qEELS, can be challenging. We report a method for in-situ calibration of q dispersion using the surface plasmon polariton (SPP) in a known material. |
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