GREEN BANDS OF CuBr

$^{a}$ The result of CuCl will be presented separately in this conference by T. Parckunnel.Author Institution: Centre of Molecular Beam and Laser Chemistry, Department of Chemistry, University of WaterlooFor a long time it was believed that the lowest lying excited state of the copper monohalides $(CuX, X=F, Cl, Br, I)$ was $^{1}II$. However, resent spectroscopic and theoretical investigations of the electronic transitions of CuH and CuF suggest that the lowest excited state is $a^{3}\Sigma^{+}$ and the $^{1}\Pi$ is the $\Omega = 1$ component of this $a^{3}\Sigma^{+}$ state. Because the other copper halides such as CuCl and CuBr are calculated to be similar, we have measured the green bands of $CuCl^{a}$ and CuBr with a Fourier transform spectrometer. The emission spectrum of CuBr was generated in flowing Ar gas (2.5 Torr) over a mixture of cuprous bromide (CuBr) and copper powder in a copper hollow cathode (100 mA). The molecular constants and the electronic structure of CuBr are revised