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- W2086239806 abstract "Na and NaF clusters were investigated by Na 1s edge excitation using synchrotron radiation provided by the Super Aco storage ring in Orsay. The Na cluster spectra show a close resemblance to the solid Na spectrum which consists essentially in an absorption jump. Only for very small clusters discrete structures appearing below the absorption spectrum are visible with small oscillator strength. This contrasts with the spectrum of Na vapour which show intensive lines attributed to Rydberg states, indicating that even in small Na clusters the valence electrons are delocalised over the whole aggregates. The NaF cluster spectra present a strong decrease in the excitonic structures with decreasing size, approaching a metallic threshold for the smallest ones. This, together with mass spectroscopy observations, allow us to infer the presence of non-stoichiometric clusters for the smallest aggregates which undergo a ‘metallisation’. The discrete excitations in NaF clusters are described in terms of a model which considers perturbation of the ion-like Rydberg states by the environment of the absorbing cation and this allows simulations in satisfactory agreement with the experimental data." @default.
- W2086239806 created "2016-06-24" @default.
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- W2086239806 date "2000-02-01" @default.
- W2086239806 modified "2023-09-26" @default.
- W2086239806 title "Sodium 1s photoabsorption spectra of Na and NaF clusters deposited in rare gas matrices" @default.
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- W2086239806 doi "https://doi.org/10.1016/s0368-2048(99)00080-8" @default.
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