OBSERVATION AND ANALYSIS OF THE $Br_{2} D^{\prime}(2g)-A^{\prime}(2u)$ TRANSITION IN A FREE-JET EXPANSION
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Date
1995
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Publisher
Ohio State University
Abstract
The $D^{\prime}-A^{\prime}$ transition of $Br_{2}$ is known primarily from emission $spectroscopy^{1}$. The $D^{\prime}$ state is readily excited by electric discharge, and discharge-pumped lasing of $Br_{2} D^{\prime}-A^{\prime}$ has been $demonstrated^{2}$. Due to large differences between the $D^{\prime}$ and $A^{\prime}$ state equilibrium internuclear searations, discharge spectra are dominated by transitions from low vibrational levels of $D^{\prime}$ to high vibrational levels of $A^{\prime}$. To provide complete descriptions of both states, we have examined the $D^{\prime}-A^{\prime}$ system in absorption. $Br_{2}(A^{\prime})$ was generated in free-jet expansions by discharge excitation (Emory) or photolysis of $B Br_{3}$ (Johns Hopkins). Bands originating from $A^{\prime}, v^{\prime\prime}=0$ and terminating on $D^{\prime}, 20 \leq v^{\prime} \leq 50$ were observed by laser induced fluorescence. Isotopic and rotational resolution was achieved. Analysis of these data is in progress. Spectroscopic constants and the radiative lifetime of $Br_{2}(D^{\prime})$ will be reported. Work supported by AFOSR
Description
1. A. Sur and J. Tellinghuisen, J. Mol. Spectrosc. 88, 323 (1981) 2. J.R. Murray, J. C. Swingle, and C.E Turner, Appl. Phys. Lett. 28, 530 (1976)
Author Institution: Emory University, Atlanta, GA 30322; Vanderbilt University, Nashville, TN 37235; The Johns Hopkins University, Baltimore, MD 21218
Author Institution: Emory University, Atlanta, GA 30322; Vanderbilt University, Nashville, TN 37235; The Johns Hopkins University, Baltimore, MD 21218