Photoinduced Charge Separation in the Carbon Nano-Onion C60@C240

Theoretical identification of buckyonion fullerene C20@C60 isomers by XPS and NEXAFS spectroscopy

The C 1s X-ray photoelectron spectroscopy (XPS) and near-edge X-ray absorption fine structure (NEXAFS) spectroscopy of two buckyonion fullerene C₂₀@C₆₀ isomers were theoretically simulated by density functional theory (DFT) method. In this paper, we mainly investigated the relationship between spectroscopy and structure and obtained the spectral dependence on the structures with different symmetries. Our results showed that both XPS and NEXAFS spectra exhibited remarkable dependence on the molecular structures, thus these two spectroscopic techniques could be adopted to identify the two C₂₀@C₆₀ isomers effectively. Additionally, we found that the building block approach could not predict the spectra for C₂₀@C₆₀ isomers due to the strong interaction between the two layer cages. Finally, we studied the decompositions of the total spectra from carbon atoms in different local environments to analyse the origins of the main features.

Two-dimensional two-photon absorptions and third-order nonlinear optical properties of Ih fullerenes and fullerene onions

The third order nonlinear optical properties of I_h symmetry fullerenes increase exponentially with fullerene size. The two-dimensional two-photon absorption spectra for C₆₀ and C₂₄₀ have strong self-phase modulation responses.

Reliable charge assessment on encapsulated fragment for endohedral systems

A simple scheme to determine charge distribution in endohedral complexes is suggested. It is based on comparison of inner-shell atomic orbital energies of the encapsulated species to the corresponding energies in reference systems with unambiguously defined charges on X. This robust approach is applied to endohedral borospherenes X@B₃₉, for which the conventional schemes provide in some cases quite different results. Efficiency of proposed scheme also has been proven for typical fullerene based Sc₃N@C₈₀ endohedral complex.