In assemblies of metal nanoparticles small random perturbations are predicted to lead to (a) a statistical energy level distribution around the Fermi level within the assembly and (b) local electron density fluctuations within each particle. ¹⁹⁵Pt relaxation experiments on monodisperse 1.2-nm-diam Pt cores in molecular metal clusters Pt₃₀₉Phen₃₆*O₃₀ agree with these predictions, whereas for the NMR line shape the presence of (b) is obscured by additional contributions from surface effects.
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Fritschij et al. (1999) studied this question.
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