Near infrared laser spectroscopy of ScBr: The e3Δ – a3Δ and d3Φ – a3Δ systems

Abstract

Electronic transition spectrum of scandium monobromide (ScBr) has been studied between 787 and 854nm using laser vaporization/reaction free jet expansion and laser induced fluorescence spectroscopy. ScBr molecule was produced by reacting Sc atom with ethyl bromide. Spectra of nine vibrational bands of the e3Δ – a3Δ and the d3Φ – a3Δ systems were obtained and analyzed. Transition lines of both Sc79Br and Sc81Br isotopes were observed. A least-squares fit of the measured line positions yielded accurate molecular constants for the v=0 and 1 levels of the d3Φ state and the v=0–2 levels of both e3Δ and a3Δ states. The bond length of the v=0 level, ro, of the a3Δ state has been determined to be 2.4533 Å. A molecular orbital energy level diagram has been used to examine the electronic configurations giving rise to the observed electronic states.