High-Resolution Laser Excitation Spectra of theA2Π ←X2Σ+System of SrBr: The 0–0 and 1–0 Bands of Sr79Br and Sr81Br

Two bands (0–0 and 1–0) of theA2Π–X2Σ+system of88Sr79Br and88Sr81Br have been analyzed rotationally for the first time. Well-resolved spectra were recorded by laser excitation spectroscopy with selective detection of fluorescence. For each band of the individual isotopomers, about 130 line positions with a measurement accuracy of ≈0.003 cm−1were employed in a least-squares fit of the excited state molecular parameters. The principal results for theA2Π state areAe= 302.432(1) cm−1andRe= 2.7147(1) Å.