The Study of Fe（CO）₅ Multiphoton Ionization Mass Spectra

Multiphoton ionization mass spectra of Fe（CO）₅ induced by XeCl excimer laser were studied with a molecular beam and a quadrupole mass spectrometer. The ion fragments CO⁺, Fe（CO）_n⁺ （n=1,2,…5） and Fe₂ （CO）_m⁺ （m=4,5,…,9） were measured. The intensities of various ion fragments were measured as a function of laser fluence and sample pressure. Our results show that a few of ion-molecule reactions are very effective in our experimental conditions. It is discussed that the dynamics of Fe（CO）₅ photo-dissociation induced by XeCl excimer laser and the formation mechanisms of the ion fragments Fe₂ （CO）_m⁺ （m= 5,6,…,9）.