, Care has, however, to be taken, when strong simplifying assumptions are used. In particular, in assuming a hard-walled and stepwise jellium-like ground-state potential with the corresponding electron density forced to zero at the particle surface, the spill-out is clearly neglected. The corresponding simulations cannot correctly reproduce the opposite tendencies for alkaline and noble metal particles, i.e. red and blue shifts of the LSPR with decreasing size. The influence of non-locality on the one hand and reduced ion, of sophistication, its comparably easy implementation and lastly its adaptability to more complex geometries, beyond high-symmetry structures like concentric spheres

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