Near infrared laser spectroscopy of ScBr: The e ~3Δ - A ~3Δ and d ~3Φ - A ~3Δ systems

摘要

Electronic transition spectrum of scandium monobromide (ScBr) has been studied between 787 and 854 nm 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 e ~3Δ - a ~3Δ and the d ~3Φ - a ~3Δ systems were obtained and analyzed. Transition lines of both Sc 79Br and Sc 81Br 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 d ~3Φ state and the v = 0-2 levels of both e ~3Δ and a ~3Δ states. The bond length of the v = 0 level, r _o, of the a ~3Δ state has been determined to be 2.4533 ?. A molecular orbital energy level diagram has been used to examine the electronic configurations giving rise to the observed electronic states.