Formation and photodissociation of Chromium/Phosphorus binary clusters

Chromium/Phosphorus binary clusters were produced by direct laser ablation and analyzed by tandem time-of-flight mass spectrometer. The main clusters formed were rich in phosphorus, There is an oscillation in CrPm+ series(the peaks with even m are stronger than those with odd m, especially the peaks of CrP4+ and CrP8+ are the strongest) and this may be ascribed to the spec ific stability of P-4 structure. There are some strong peaks such as Cr3P8, Cr4P9+, Cr5P11+, Cr6P12+, Cr8P14+, etc., which don't change with the chan ge of the ratios of Cr to P in the samples, and their stability could be ex plained with an electron model of valence electrons filling the d orbitals of Cr, The results of photodissociation just accord with the model.