Abstract
The (0,0), (0,1), (0,2), (0,3), (1,2), (1,3), (1,4) and (2,4) bands of the C1Σ–X 1Σ transition of YBr, between 720 and 765 nm, have been studied using the technique of laser vaporization/reaction with supersonic cooling and laser induced fluorescence spectroscopy. Spectra of both Y79Br and Y81Br isotopic molecules were observed and analysed. A merged least-squares fit of the measured line positions yield molecular constants for the = 0–2 levels of the C 1Σ state and the = 0–4 of the X1Σ state. The equilibrium bond length of the C1Σ state has been determined to be 2.6087(2) A.
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