Extended Data Fig. 3: Orientation dependence of vibrational spectra obtained by dark-field EELS.
From: Imaging of isotope diffusion using atomic-scale vibrational spectroscopy
The signal is almost identical regardless of the position of the EELS collection aperture (green, red and black); therefore, the in-plane orientation of graphene hardly affects the fitting parameters. The lattice defects in graphene also do not affect these parameters, except for the acoustic vibration mode in the lower peak, which is considered negligible.
