Spectra, radiative lifetimes, and band oscillator strengths of theAthinsp;1Pgr;ndash;Xthinsp;1Sgr;+transition of BH

摘要

We report new spectroscopic information on theAthinsp;1Pgr;ndash;Xthinsp;1Sgr;+transition of BH including the observation of the 0ndash;1 and 1ndash;2 bands using laser induced fluorescence (LIF) techniques. Ratios of Einstein coefficients, band oscillator strengths and transition probabilities have been obtained for the 0ndash;1 compared to the 0ndash;0 band and the 1ndash;0 and 1ndash;2 compared to the 1ndash;1 band. These ratios indicate that the emission observed occurs predominantly within the diagonal elements. Additionally, the radiative lifetimes of thevrsquo;=0, 1, and 2 levels have been measured to be 127plusmn;10, 146plusmn;12, and 172plusmn;14 ns, respectively. Using the ratios above and the experimental lifetimes, we have obtained Einstein emission coefficients and band absorption oscillator strengths. These values are compared to several calculations from the literature and in some instances large differences are seen.