Abstract
The correlation between the electronic configurations of Au atom in the ground and excited electronic states and the Epl plasmon energies of gold nanoparticles is studied in the many-electron approximation, taking into account 5d, 6s, and 6p valence electrons. Relativistic effects are found to result in the Epl splitting in the visible and ultraviolet spectral ranges, and the splitting energies are predicted. The origin of low-energy plasmons with Epl = 1.14, 2.7, and 6.4 eV is determined by 5d96s2(2D5/2), 5d96s2(2D3/2), and 5d5/296s1/26p1/2 excited electronic configurations of Au atom. The bulk plasmon energy Epl = 25.4 eV is assigned to the mixed oxidation states of Au ions in the nanoparticle cores.
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