Rotational analysis of an electronic transition of CuOH observed with intracavity laser spectroscopy

Harms, Jack C.

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https://hdl.handle.net/2142/100671 Copy

Description

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.

Issue Date

2018-06-22

Keyword(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 H2 and 200 mTorr of O2 as sputter gases to produce CuOH, or 800 mTorr of O2 and 200 mTorr of D2 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 µsec and a 130 mm long cathode, the effective pathlength for the measurements was approximately 7 km. Each 6 cm−1wide spectral segment was calibrated by fitting I2 absorbance features from spectra collected from an extracavity I2 cell at each monochromator position (with the plasma turned off) to the I2 reference data of Salami and Ross. Deviations between the recorded and reference I2 features were typically less than ±0.002 cm−1 . Two strong red-degraded Q-bandheads are observed in the CuOH spectrum, located at 15,155 cm−1 and 15,093 cm−1 . These bands are consistent with an electronic transition briefly mentioned but not analyzed in a publication on the A 1A’-X 1A’ transition of CuOH by Jarman et al. from 1991. The isotopologue shifts of the CuOD Q-heads are +4.5 cm−1 and +5.0 cm−1 , respectively. The transitions for both isotopologues have P-, Q-, and R-branches with no observed splitting. Each branch is accompanied by features due to 65CuOH that are approximately 40% of the intensity of the main features, consistent with natural abundances of 69.17% 63Cu and 30.83% 65Cu. Ground state constants for CuOH and CuOD are determined from the millimeter wave spectra of Whitham et al., and the transitions will be fit using PGOPHER. Results of the analysis will be presented.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Permalink

http://hdl.handle.net/2142/100671

DOI

10.15278/isms.2018.FB08

Copyright and License Information

Copyright 2018 Jack C. Harms

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