TITLE

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

AUTHOR(S)
Ridley, T.; de Vries, M.; Lawley, K. P.; Wang, S.; Donovan, R. J.
PUB. DATE
October 2002
SOURCE
Journal of Chemical Physics;10/15/2002, Vol. 117 Issue 15, p7117
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Using a resonant multiphoton excitation pathway, it is shown that electronic states down to 30 cm[SUP-1] below the first ion-pair dissociation threshold of I[SUB2] can be efficiently converted from initially prepared well-defined low-J states to long-lived (τ[SUBd]>4 μs), 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[SUP+] +I[SUP-] ). 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[SUP+]/I[SUP-] signal, agrees well with the literature value.
ACCESSION #
7431025

 

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