D' Yields A' Transition in the Emission Spectrum of IBr

摘要

Since at least the 1920s the diatomic halogen molecules have been known to exhibit prominent UV-visible emission spectra when excited by electrical and/or optical means in the presence of inert buffer gases. On the other hand the D'- A' systems are strong in emission, hence are amendable to the methods of conventional spectroscopy. Using Tesla discharge sources probably similar to those used by Filippov almost 60 years ago, workers in this laboratory have photographed and analyzed the D'- A' systems of I2(5, 13), Br2(5, 14), Ic1(15), BrF(16), Cl2(17), and BrCl(18). Our only trick has been the use of isotopically pure halogens in our sources, coupled with a moderately high-resolution yet fast spectrometer. The present work continues this series with a vibrational analysis of the D'- A' system in IBr.