Two-photon ionization and dissociation of ethyl iodide

Knoblauch, Nils; Strobel, Andreas; Fischer, Ingo; Bondybey, Vladimir E.
October 1995
Journal of Chemical Physics;10/1/1995, Vol. 103 Issue 13, p5417
Academic Journal
Both spin–orbit states of C2H5I+, the X1 2E1/2 and the X2 2E1/2 electronic states, are studied by one-color two-photon ionization of ethyl iodide, utilizing the zero kinetic energy pulsed field ionization (ZEKE-PFI) photoelectron technique. Compared with conventional photoelectron data the two-photon spectra exhibit a more extensive vibrational structure mainly involving the C–I stretching and the C–C–I bending modes. This additional vibrational excitation in the two-photon spectra is discussed in terms of mode selective resonance enhancement by the dissociative A-state continuum. Accurate values for the vibrational frequencies and the ionization energies are obtained. The appearance of nontotally symmetric modes in the two-color ZEKE spectra is reported. © 1995 American Institute of Physics.


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