LASER SPECTROSCOPY OF THE $\tilde{A}^2\Pi-\tilde{X}^2\Sigma^+$ TRANSITION OF BaOH

Author Institution: Department of Chemistry, University of York, Heslington, York, YO10 5DD, UKThe $\tilde{A}^2\Pi-\tilde{X}^2\Sigma^+$ transition of BaOH has been rotationally analyzed using the technique of high resolution laser excitation spectroscopy. The BaOH molecules were synthesized in a Broida-type oven and a single mode Ti:Sapphire laser was used to record the spectra. Two vibronic bands ($001-001$ and $001-000$) in addition to the $000-000$ band have also been observed and assigned. Rotational and fine structure parameters were determined through a combined least-squares fit with the millimeter-wave pure rotational data of the ground state