The field-ionization of near-dissociation ion-pair states of I-2

Trevor Ridley, Mark De Vries, Kenneth Lawley, Shiliang Wang, Robert Donovan

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Using a resonant multiphoton excitation pathway, it is shown that electronic states down to 30 cm(-1) below the first ion-pair dissociation threshold of I-2 can be efficiently converted from initially prepared well-defined low-J states to long-lived (tau(d)>4 mus), subthreshold zero ion kinetic energy (ZIKE) ion-pair states which are analogous to high, zero electron kinetic energy, Rydberg states. A pulsed electric field is used to dissociate the ZIKE states and produce free-ion pairs (i.e., I++I-). Direct excitation to very high vibrational levels of the ion-pair states is ruled out and polarization data are used to probe the spectroscopic character of the doorway states to free-ion formation. The ion-pair dissociation limit, determined from the extrapolation to zero field of the onset of the prompt I+/I- signal, agrees well with the literature value.
Original languageEnglish
Pages (from-to)7117
Number of pages4
JournalThe Journal of Chemical Physics
Issue number15
Publication statusPublished - 15 Oct 2002


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