Abstract
The first rotational analysis of BaBr has been performed. The near-infrared A2π-X2Σ+ and B2Σ+-X2Σ+ band systems of BaBr were recorded in absorption by using Fourier transform spectroscopy (FTS). Laser induced fluorescence spectra from both systems obtained by exciting with a Ti: sapphire single mode laser were recorded with FTS techniques in order to simplify the otherwise dense spectra. No direct combination difference approach was possible in order to analyse the absorption bands in detail, why the rotational line measurements were processed using semiautomatic iterative routines for synthesizing and evaluating molecular spectra. Resolved rotational data consisting of around 5000 lines of 138Ba81Br, originating from 10 vibrational bands including the vibrational levels ν=0–2 of the A2π and X2Σ+ states and ν=0–1 of the B2Σ+ state, were used in the final analysis. The observed anomalous intensity distribution and the interaction between the A2π and B2Σ+ states are discussed.
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