IMPROVEMENT OF SPECTROSCOPIC CONSTANTS FOR THE $A^{3}\Pi_{1u}$ $\leftarrow X^{1}\Sigma^{+}_{g}$ SYSTEM OF Br${}_{2}$
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Date
2011
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Publisher
Ohio State University
Abstract
High-resolution spectroscopy in the near infrared region is very important for frequency standards. We have measured the Doppler limited vibrational-rotational spectrum of ICl,, 43 (2009).} IBr,, 132 (2002).} I$_2$, 271 (1997).} and Br$_2$ by using a titanium sapphire laser, and have reported their spectroscopic constants. The present work presents revised spectroscopic constants for the $X$-state of Br$_2$ which are obtained by performing a combined-isotopologue least-squares fit to all available data for the three isotopic species. We are also attempting to observe the lowest vibrational levels of the $A$-state in order to allow us to determine the potential energy function of this state. Measurements were made at room temperature in the region $13000-13700~{\rm cm}^{-1}$ and at 150-250$^irc$C in the region $11600-13000~{\rm cm}^{-1}$. Details of these results will be presented.
Description
Author Institution: Department of Electronics and Information Technology, Tokyo; Polytechnic University, Iiyama 1583, Atsugi-City, 243-0297 Kanagawa, Japan; Department of Chemistry, University of Waterloo, Waterloo; Ontario N2L 3G1, Canada