Laser photoelectron spectroscopic determination of electronic states of Fe atoms produced in multiphoton dissociation of Fe(CO)5 in the gas phase

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Abstract
Multiphoton ionization (MPI) ion–current and photoelectron measurements were carried out for Fe(CO)5 in the gas phase with a visible dye laser in the wavelength region 446–452 nm. This wavelength region was chosen for the reason that the MPI ion–current spectrum shows a typical complicated pattern consisting of many atomic lines. At least 35 sharp ion–current peaks have been detected under moderate laser power conditions in the present work. From the observed photoelectron spectra, all these ion–current peaks have been successfully assigned to three-photon ionizations of Fe atoms which are produced in the five low-lying electronic states in the photodissociation of Fe(CO)5. In this paper, we want to report photoelectron spectroscopic evidences for the production of the excited state Fe atoms in the laser photolysis of Fe(CO)5. Furthermore we want to emphasize the potentiality of laser photoelectron spectroscopy for identification of various nonradiative electronic states of transient species.