Laser multiphoton dissociation-multiphoton ionization and photoelectron spectroscopy of Fe(C5H5)2, Co(C 5H5)2, and Ni(C5H5) 2

Abstract

Laser multiphoton dissociation-resonance-enhanced multiphoton ionization (MPD-REMPI) and time-of-flight photoelectron spectra (TOF-PES) of Fe(C 5H5)2, Co(C5H5) 2, and Ni(C5H5)2 have been obtained in the range 380-390 nm, and the MPD-REMPI of Fe(C5H 5)2 and Co(C5H5)2 have been obtained in the range 445-455 nm. The only ions produced by the pulsed dye laser are Fe+, Co+, and Ni+. Transitions observed in the MPD-REMPI spectra are assigned to resonant states of the neutral atoms. Final states of the atomic ions are determined from the TOF-PES spectra. For Ni and Co, there appears to be a propensity for core preservation of the resonant state upon ionization if the resonant state has an electron configuration with an electron in a d-type Rydberg orbital. For Fe, no such propensity is observed. © 1992 American Institute of Physics.