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 Title: ROTATIONAL ANALYSIS OF AN ELECTRONIC TRANSITION OF CuOH OBSERVED WITH INTRACAVITY LASER SPECTROSCOPY Author(s): Harms, Jack C. Contributor(s): O'Brien, James J.; O'Brien, Leah C. Subject(s): Metal containing Abstract: An electronic transition of CuOH has been observed in the red using Intracavity Laser Spectroscopy (ILS). The CuOH molecules were produced in the 0.60 A RF-discharge of a Cu hollow cathode using either 1 Torr of H$_{2}$ and 200 mTorr of O$_{2}$ as sputter gases to produce CuOH, or 800 mTorr of O$_{2}$ and 200 mTorr of D$_{2}$ to produce CuOD. The hollow cathode was located in the resonator cavity of a dye laser, enabling the enhancement of molecular absorption features through laser action. Using a generation time of 200 $\mu$sec and a 130 mm long cathode, the effective pathlength for the measurements was approximately 7 km. Each 6 \wn wide spectral segment was calibrated by fitting I$_{2}$ absorbance features from spectra collected from an extracavity I$_{2}$ cell at each monochromator position (with the plasma turned off) to the I$_{2}$ reference data of Salami and Ross. Deviations between the recorded and reference I$_{2}$ features were typically less than $\pm$0.002 \wn. Two strong red-degraded Q-bandheads are observed in the CuOH spectrum, located at 15,155 \wn and 15,093 \wn. These bands are consistent with an electronic transition briefly mentioned but not analyzed in a publication on the \textit{A} $^{1}$A'-\textit{X} $^{1}$A' transition of CuOH by Jarman \textit{et al}. from 1991. The isotopologue shifts of the CuOD Q-heads are +4.5 \wn and +5.0 \wn, respectively. The transitions for both isotopologues have P-, Q-, and R-branches with no observed splitting. Each branch is accompanied by features due to $^{65}$CuOH that are approximately 40\% of the intensity of the main features, consistent with natural abundances of 69.17\% $^{63}$Cu and 30.83\% $^{65}$Cu. Ground state constants for CuOH and CuOD are determined from the millimeter wave spectra of Whitham \textit{et al}., and the transitions will be fit using PGOPHER. Results of the analysis will be presented. Issue Date: 06/22/18 Publisher: International Symposium on Molecular Spectroscopy Citation Info: APS Genre: Conference Paper / Presentation Type: Text Language: English URI: http://hdl.handle.net/2142/100671 DOI: 10.15278/isms.2018.FB08 Other Identifier(s): FB08 Date Available in IDEALS: 2018-08-172018-12-12
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