THE $B(1/2^{2}P_{3/2}) \rightarrow X(1/2^{2}\Sigma^{+}$) TRANSITION IN XeBr

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Title: THE $B(1/2^{2}P_{3/2}) \rightarrow X(1/2^{2}\Sigma^{+}$) TRANSITION IN XeBr
Creators: Clevenger, Jason O.; Tellinghuisen, Joel
Issue Date: 1996
Publisher: Ohio State University
Abstract: The $B(1/2^{2}P_{3/2}) \rightarrow X(1/2^{2}\Sigma^{+}$) transition in XeBr was recorded in high resolution, using a CCD array detector to record spectra from Tesla discharge sources containing isotopically pure $^{136}$Xe with $^{81}Br_{2}$ or $^{79}Br_{2}^{ab}$. The high signal/noise capabilities of the detector permitted the measurement of discrete vibrational structure in this system, which has normally been treated as a purely bound-free transition. The assingments comprised 119 $v^{\prime\prime}-V^{\prime\prime}$ bands for $^{136}Xe_{81}Br$ and 86 for $^{136}Xe_{79}Br$, spanning $v^{\prime\prime}$=0.33 and $v^{\prime\prime}$=0.16. The van der Waals ground state was analyzed through fits to the customary polynomials and to near-dissociation expansions. Franck-Condon calculations were used to locate the X-state potential on the internuclear axis relative to the $B$ state, which was modeled as Rittner potential. The following fundamental spectroscopic constants (units $cm^{-1}$ for $^{136}Xe_{81}Br$) were obtained from the analysis: $T^{\prime}_{e} = 35 863.2, \omega^{\prime}_{e} = 135.72, \omega_{e}x^{\prime}_{e}=0.32, \omega^{\prime\prime}_{e} = 25.7, \omega_{e}x^{\prime}_{e}= 0.62$. The ground state has dissociation energy $D^{\prime\prime}_{e} = 254 \pm 2$ cm $^{-1}$ and supports 24 bound vibrational levels.
Description: $^{a}$ Jason O. Clevenger and Joel Tellinghuisen, Chem. Phys. Lett. 231, 515 December 1994. $^{b}$ Jason O. Clevenger and Joel Tellinghuisen, J. Chem. Phys. 103(22), 9611 December 1995.
Author Institution: Department of Chemistry, MIT; Department of Chemistry, Vanderbilt University
Other Identifiers: 1996-RE-13
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