Optical response ofC₆₀fullerene from a time dependent Thomas Fermi approach

Abstract

We study the collective electron dynamics in C60 clusters within the Time Dependent Thomas Fermi method in the frame of jellium model. The results regarding the optical spectrum are in good agreement with the experimental data, our simulations being able to reproduce both resonances from 20eV and 40eV . We compare also, the results with those from other theoretical approaches and investigate the implications of quantum effects including exchange-correlation corrections, or gradient corrections from a Weizsacker term. The nature of the second resonance is studied using transition densities and phase analysis and interpreted as being a collective surface plasmon .

Electron Production by Sensitizing Gold Nanoparticles Irradiated by Fast Ions

“…This variation leads to the formation of the surface plasmon, which has two normal modes, the symmetric and antisymmetric ones [64][65][66][67]. It has been argued previously [33,35,67,68] that only the surface plasmon can occur in the system interacting with a uniform external electric field, as it happens in the photoionization process. When a system interacts with a non-uniform electric field created, for instance, in collision with a charged particle, the volume plasmon can also occur due to a local compression of the electron density in the shell interior [35,38].…”

Generalized hydrodynamics revisited

“…To simplify and clarify the notation the fields n (r, t) , e 0 (r, t) , and u (r, t) will be denoted {ζ (r, t)} ≡ {n (r, t) , e 0 (r, t) , u (r, t)} (25) so that (24) becomes…”

N-block separable random phase approximation: dipole oscillations in sodium clusters and ${C}_{60}$ fullerene

“…In electron energy loss experiments three volumes plasmons emerge in the 20 − 30eV range [34]. The theoretical work done in this direction has been able to reproduce the experimental values from many perspectives as RPA [35], ab-initio [], TDDFT [33], Time-Dependent Thomas Fermi [36], etc. Since it is genuinely a more complicated system than the simple alkali N a clusters we considered it as a good further test case for the present formalism.…”