# ROTATIONAL STRUCTURE OF THE $A'_{5}\Delta - x'_{5}\Pi$ ELECTRONIC TRANSITION OF CrO

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 Title: ROTATIONAL STRUCTURE OF THE $A'_{5}\Delta - x'_{5}\Pi$ ELECTRONIC TRANSITION OF CrO Creators: Barnes, M.; Hajigeorgiou, P. G.; Merer, A. J. Issue Date: 1992 Publisher: Ohio State University Abstract: The laser-induced fluorescence spectrum of CrO was recorded at Doppler-limited resolution in the near-infrared employing a single-frequency tunable cw Ti:sapphire ring laser. The (O,O) band centred near 8400 {\AA} consists of five unperturbed sub-bands each characterized by readily identifiable P, Q, and R branches. Rotational analysis confirmed the nature of the excited state of the red system of CrO as $^{5}\Delta$ in accord with a recent low-resolution $study^{1}$. Spectroscopic measurements from the present analysis were combined with those of the $A^{5}\Sigma^{+} - X^{5}\Pi$ (0,0) transition recorded previously using an FTIR $spectrometer^{2}$. A weighted nonlinear least-squares fit furnished improved molecular parameters for the $A^{5}\Sigma^{+}$ and $X^{5}\Pi$ electronic states as well as the first set of reliable constants for the $A^{5}\Delta$ state. Description: $^{1}$T. C. Devore and J. L. Gole, Chem. Phys. 133, 95 (1989). $^{2}$A. 8-C Cheung, W. Zyrnicki, and A. J. Merer, J. Mol. Spectroac. 104, 315 (1984). Author Institution: Department of Chemistry, University of British Columbia URI: http://hdl.handle.net/1811/12875 Other Identifiers: 1992-TF-01