Two-photon ionization of alkali-halide clusters spectroscopy of excess-electron excited states

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Abstract
Na n F n−1 clusters are produced in a laser vaporization source. They are ionized by one‐photon or resonant two‐photon ionization, and detected in a high resolution time of flightmass spectrometer. By scanning the ionization wavelength, it is possible to obtain ionization potentials and absorption spectra of these clusters, for n ranging from 2 to 42. The results we obtain show many discrepancies with the cuboid model, which has proven valid for small sizes. The possible origin of these disagreements is discussed.