The B3Π(0+) → X1Σ+ emission spectrum of 79BrF and 81BrF in the range 6250–8700 Å: Rotational analysis of bands in the v′ = 0, 1, 2, 3, 4 progressions, and merged molecular constants for the X1Σ+ and B3Π(0+) states

Abstract

Sixteen emission bands of the B3Π(0+) → X1Σ+ systems of 79BrF and 81BrF have been analyzed rotationally. Measured line frequencies are fitted by least-squares to determine the rotational constants and origin for each band. The least-squares results for 0 ≤ v′ ≤ 4 and 4 ≤ v″ ≤ 12 are merged with constants from previously reported B ← X absorption and X-state microwave data. RKR potentials for the two states and Franck-Condon factors and r-centroids for the BrF (B-X) system are reported.