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Rotational Analysis of an Electronic Transition of CuOH Observed with Intracavity Laser Spectroscopy
Proceedings of the 73rd International Symposium on Molecular Spectroscopy (2018)
  • Jack Harms, University of Missouri-St. Louis
  • James O'Brien, University of Missouri-St. Louis
  • Leah O'Brien
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 H22 and 200 mTorr of O22 as sputter gases to produce CuOH, or 800 mTorr of O22 and 200 mTorr of D22 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 μμsec 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 I22 absorbance features from spectra collected from an extracavity I22 cell at each monochromator position (with the plasma turned off) to the I22 reference data of Salami and Ross. Deviations between the recorded and reference I22 features were typically less than ±±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} 11A'-\textit{X} 11A' 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 6565CuOH that are approximately 40\% of the intensity of the main features, consistent with natural abundances of 69.17\% 6363Cu and 30.83\% 6565Cu. 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.
Publication Date
June 22, 2018
DOI
10.15278/isms.2018.fb08
Citation Information
Jack Harms, James O'Brien and Leah O'Brien. "Rotational Analysis of an Electronic Transition of CuOH Observed with Intracavity Laser Spectroscopy" Proceedings of the 73rd International Symposium on Molecular Spectroscopy (2018)
Available at: http://works.bepress.com/james-obrien/19/