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 Title: A REEXAMINATION OF THE RED BAND OF CuO: ANALYSIS OF THE [16.5] 2Σ− - X 2Πi TRANSITION OF 63CuO and 65CuO Author(s): Harms, Jack C Contributor(s): O'Brien, James J; O'Brien, Leah C; Ahmed, Bushra; Yun, Sirkhoo; Grames, Ethan M Subject(s): Metal containing Abstract: The red band of CuO has been observed at high resolution using Intracavity Laser Spectroscopy (ILS). The red band was rotationally analyzed in 1974 by Appelblad and Lagerqvist and a portion of the band structure was assigned as the spectrum of the [16.5] $textit{A}$ $^{2}Sigma^{+}$ - $textit{X}$ $^{2}Pi_{i}$ transition. Subsequent analyses of CuO showed that the character of the $textit{A}$ state was $^{2}Sigma^{-}$ in character, and thus the $Lambda$-doubling parameter, $textit{p}$, was inverted, and the $textit{e}$/$textit{f}$ parity assignments were reversed. In this study, the spectrum of CuO was recorded in the in the regions 16,150 wn – 16,270 wn and 16,405 wn - 16,545 wn. The CuO molecules were produced in the plasma discharge of a copper hollow cathode within the cavity of a tunable dye laser, using 0.6 torr of argon as the sputter gas and a trace amount of chem{O_2} as the source of oxygen. The plasma spectra were recorded intermittently with spectra from an external chem{I_2} cell, and line positions from the widely used Iodine Atlas were used for calibration. In uncongested regions of the spectrum, both $^{63}$CuO and $^{65}$CuO were observed with appreciable intensity. The resulting spectra were rotationally analyzed for both isotopologues, fitting the data as a $^{2}Sigma^{-}$ - $^{2}Pi_{i}$ transition using PGOPHER. Line positions from the millimeter wave and FTIR studies of $^{63}$CuO performed in the late 1990s were included in the fit to overcome potential complications due to the ambiguous parity assignments prevalent in the CuO literature. Previously unreported molecular constants were obtained from the fit for $^{65}$CuO, and the constants of $^{63}$CuO are determined to at least an order of magnitude greater than the results of Appelblad and Lagerqvist. Results of this analysis will be presented. Issue Date: 6/21/2017 Publisher: International Symposium on Molecular Spectroscopy Citation Info: APS Genre: CONFERENCE PAPER/PRESENTATION Type: Text Language: English URI: http://hdl.handle.net/2142/97059 DOI: 10.15278/isms.2017.WK09 Date Available in IDEALS: 2017-07-272018-01-29
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