Extended Data Fig. 1: EEL spectra including zero-loss peaks at bright field and dark field.
From: Imaging of isotope diffusion using atomic-scale vibrational spectroscopy
a, EEL spectrum at bright field without samples. b, c, Linear- and log-scaled EEL spectra at dark field on 13C graphene. The natural width of the zero-loss peak in the ideal on-axis condition has been shown. As an instrumental function, the zero-loss half-width is 18 meV, whereas it is 45 meV in the off-axis condition (with sample). The zero-loss peak in the off-axis is an ambiguous concept and cannot be detected without a sample.
