# A STUDY OF THE $A^{2}\Pi/B^{2}\Sigma^{+} - X^{2}\Sigma^{+}$ BAND SYSTEMS OF CALCIUM MONOHYDRIDE, CaH, USING A SUPERSONIC MOLECULAR BEAM SOURCE AND LASER INDUCED FLUORESCENCE DETECTION

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 Title: A STUDY OF THE $A^{2}\Pi/B^{2}\Sigma^{+} - X^{2}\Sigma^{+}$ BAND SYSTEMS OF CALCIUM MONOHYDRIDE, CaH, USING A SUPERSONIC MOLECULAR BEAM SOURCE AND LASER INDUCED FLUORESCENCE DETECTION Creators: Gengler, Jamie; Steimle, T. C.; Chen, Jinhai Issue Date: 2004 Publisher: Ohio State University Abstract: The high-resolution laser induced fluorescence spectrum of a molecular beam sample of calcium monohydride, CaH, in the region of the strongly overlapped (1,0) $A^{2}\Pi-X^{2}\Sigma^{+}$ and $(0,0) B^{2}\Sigma^{+}{_{-}}X^{2}\Sigma^{+}$ band systems near 630 nm and the $(0,0) A^{2}\Pi-X^{2}\Sigma^{+}$ band system near 690 nm have been recorded and analyzed. The spectral features exhibit a small splitting which is attributed to proton magnetic hyperfine interactions in the $X^{2}\Sigma^{+} (v=0)$ $state^{a,b}$. The energy levels of the $A^{2}\Pi (v=0)$ and $X^{2}\Sigma^{+} (v=0)$ vibronic states were modeled using a traditional effective Hamiltonian approach, where as those for the interacting $A^{2}\Pi (v=1)/B^{2}\Sigma^{+} (v=0)$ vibronic levels were modeled by augmenting the traditional effective Hamiltonian with terms to account for local perturbations. A comparison to the analysis of the high temperature spectra performed by $Martin^{c}$, which did not include many of the spectral features of the present work, will be given. Description: $^{a}$C.I. Frum, J.J. Oh, E.A. Cohen, and H.M. Pickett, Ap. J. 408 L61 (1993). ${^{b}}$W.L. Barclay, Jr., M.A. Anderson, and L.M. Zuirys, Ap. J. 408, L65 (1993). ${^{c}}$H. Martin, J. Mol. Spec. 108, 66 (1984). Author Institution: Department of Chemistry and Biochemistry, Arizona State University URI: http://hdl.handle.net/1811/21333 Other Identifiers: 2004-RH-10