Two-color photoionization spectroscopy of polyatomic molecules and cations: aniline, phenol and phenotole (original) (raw)

Two-color, two-photon resonance-enhanced ionization spectra have been obtained for aniline, phenol and phenetole near and above the ionization threshold in an effusive and supersonic beam. Precise adiabatic io~tion energies have been measured. The electric field dependence of these energies is found to be consistent with a field-ionization red shift of the thresholds. The two-color photoionization te&nique has been successfully applied to determine a set of vibrational frequencies of the excited neutral and ground ionic states of these molecules.