# $I(^{2}P_{1/2})+I_{2}(X)$ ENERGY TRANSFER AND RE-ANALYSIS OF THE $I_{2}$ D-X SYSTEM.

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 Title: $I(^{2}P_{1/2})+I_{2}(X)$ ENERGY TRANSFER AND RE-ANALYSIS OF THE $I_{2}$ D-X SYSTEM. Creators: Nowlin, M. L.; Heaven, M. C. Issue Date: 1993 Abstract: The electronic to vibrational energy transfer process $I(^{2}P_{1/2}) + I_{2}(X, \nu^{\prime \prime}=0) \rightarrow I(^{2}P_{3/2}) + I_{2}(X, 33<\nu^{\prime \prime}<44)$ is thought to play an important role in the chemical oxygen iodine laser (COIL). We are examining the nascent state distribution of the $I_{2}(X)^{\dag}$ product using pulsed laser photolysis and probe techniques. In these experiments, $I(^{2}P_{1/2})$ is generated by 490 nm photolysis of $I_{2}$. After a few micro seconds delay, $I_{2}(X)^{\dag}$ is detected by laser excitation of the D-X transition at wavelengths in the 280-300 nm range. Rotationally-resolved spectra for the D-X transitions $0<\nu^{\prime}<10 \leftarrow 33<\nu^{\prime \prime}<44$ have been recorded under single transfer event conditions. An initial analysis of these data indicated that the existing molecular constants for the D state did not extrapolate to the $v^{\prime}<10$ levels reliably. In order to improve the characterization of the D state we have supplemented the room temperature data with rotationally cold $(T_{R}\approx 10K) D-X$ spectra taken in a free-jet expansion. Revised molecular constants for the $I_{2} D$ state, and an analysis of the population distribution resulting from transfer reaction (1) will be presented. URI: http://hdl.handle.net/1811/18469 Other Identifiers: 1993-MF-9