ION-PAIR TO VALENCE TRANSITIONS OF JET-COOLED IBr
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Date
1992
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
Metastable stable of IBr ($A^{\prime}(2)$ and A(1)) have been populated by UV excitation in the presence of a high pressure of Ar buffer gas. Absorption of the pulses from a 193 nm ArF laser populated the IBr $E(0^{+})$ ion-pair state. Collisional relaxation transferred this population to the $D^{\prime}(2)$ and $\beta$(1) states, which then radiated to the $A^{\prime}(2)$ and A(1) states. This sequence was initiated in the early stages of a free-jet expansion. Subsequent expansion and cooling resulted in $A^{\prime}(2)$ and A(1) state rotational temperatures of 10-20 K. The $D^{\prime}-A^{\prime}$ and $\beta$-A transitions were then characterized, at the level of rotational resolution, by laser induced fluorescence spectroscopy. Progressions originating from $A^{\prime}(2) v=0$ to 4(82 bands), and A(1) $v=0$, 1 (35 bands) have been observed. Analysis of this data is in progress. Experimental details and molecular constants will be reported.
Description
Author Institution: Department of Chemistry, Emory University; Department of Chemistry, Vanderbilt University