A new band system in the red region of CuBr

Abstract

A new band system of CuBr involving two new electronic states has been observed in the spectral region 5900-6300 AA. This is the first observation of a transition involving two excited states in any diatomic copper halide. The transition appears to be Delta Lambda =0 type. The vibrational assignments of the bands have been confirmed by measuring the isotopes shifts. The vibrational constants for the two states for 63Cu79Br are omega e'=300.35 cm-1, omega e"=241.52 cm-1, omega e'xe'=0.42 cm-1, omega e"xe"=1.46 cm-1 and nu e=16267.55 cm-1. A partial rotational analysis of the (0,0) band has also been carried out.