Nature research paper: Imaging of isotope diffusion using atomic-scale vibrational spectroscopy
C andC graphene is 7.7 meV at the highest energy peak in PDOS corresponding to the LO mode and 6.7 meV at the second highest energy peak which is mainly contributed from the LO/TO mode. The interatomic force constants calculated from DFPT is, for instance, 52.4 eV Åfor the in-plane direction at Γ. This calculation was performed to estimate the energy shift of the PDOS ofC with the simple model.
When the electron beam is fixed on an atom with our probe condition in which the probe size is increased to gain the current, the resulting spectrum contains the signal of the nearest three atoms in addition to that of the atom at the centre of the probe. Thus, a single spectrum roughly consists of the average signal of four atoms. The momentum space was also integrated up to 3.5 Å. Therefore, the spatial resolution was influenced by the integration effect in both real and momentum space.
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