Abstract
Na n F n- p clusters were produced in a laser vaporization source. They were ionized by one photon and detected in a high-resolution time of flight mass spectrometer. Only odd values of p were observed, apart from Na 4F 2, Na 8F 6, Na 14F 12 and Na 23F 21. Ionization potentials (IP) were measured for n up to 30 and p up to 5. The IPs of the Na 14F 14- p sequence are in good agreement with existing theoretical predictions. Na 15F 12 and Na 24F 21 have a surprisingly low IP, which indicates that the metallization sequence is of a different nature in this case.
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