Abstract

Using molecular beam apparatus and a modified quadrupole mass spectrometer, the multiphoton ionization mass spectra of Fe(CO)₅ vapor was investigated by irradiation with a XeCl excimer laser. By changing the laser intensity and sample pressure, we measured the ion peaks of Fe⁺, CO⁺, FeC⁺, $\text{Fe}{(\text{CO})}_n^{+}(n=1,2,\dots ,5)$ and ${\text{Fe}}_2{(\text{CO})}_m^{+}(m=4-9)$. The ion intensity of Fe⁺ was the strongest among these ion peaks in all experimental conditions. In comparison with Fe⁺, the ion intensity of ${\text{Fe}}_2{(\text{CO})}_m^{+}(m=4-9)$ was extremely weak.

© 1986 Optical Society of America