Absorption spectrum of bromine from 6200 to 5100 Å

Abstract

The absorption spectrum of the ³Π_0+u–¹Σ⁺_g system of bromine between 6200 and 5100 Å has been photographed at high resolution using each of the separated isotopic species ⁷⁹Br₂ and ⁸¹Br₂. A rotational analysis of ten bands of each isotopic species has been carried out. The accepted vibrational numbering was confirmed. The constants obtained (cm^–1) for each species are:- [graphic omitted]. Revised constants for the most abundant isotopic species ^{79 81}Br₂ have been calculated.

The last four bands immediately preceding the onset of the continuum have also been analyzed for each species. A limiting curve of dissociation has been plotted in each case leading to an average value for D₀(^{79 81}Br₂) of 15,893.1 ± 1.0 cm^–1.