Mass-independent Dunham analysis of new electronic transitions of PtX (X=F, Cl) observed using Intracavity Laser Spectroscopy

Harms, Jack C.

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https://hdl.handle.net/2142/104307 Copy

Description

Title

Mass-independent Dunham analysis of new electronic transitions of PtX (X=F, Cl) observed using Intracavity Laser Spectroscopy

Author(s)

Harms, Jack C.

Contributor(s)

• O'Brien, James J.
• O'Brien, Leah C.

Issue Date

2019-06-19

Keyword(s)

Metal containing

Abstract

Several vibrational bands of new electronic transitions of PtF and PtCl have been recorded in absorption using Intracavity Laser Spectroscopy (ILS). The PtX molecules were produced in current-regulated RF plasma discharges, operating with 0.30-0.80 A applied to a Pt-lined Cu hollow cathode in approximately 1 Torr of an Ar/He sputter gas mixture. A trace amount of \chem{SF_6} was used as the fluoride source for PtF, and a trace amount of \chem{CCl_4} was used as the chloride source for PtCl. The hollow cathode was located within the resonator cavity of either a DCM dye laser (14,500-16,500 \wn) or Ti:Sapphire laser (12,890-12,990 \wn; 13,255-13,365 \wn), and effective pathlengths of 0.4-2.0 km were utilized with the ILS method. Six vibrational bands were identified for PtF and eight vibrational bands were identified for PtCl. These band systems were assigned to the [15.8+x] $\Omega$=5/2-\textit{B} $^{2}\Delta_{5/2}$ transition of PtF and the [13.8] $\Omega$=3/2-\textit{X} $^{2}\Pi_{3/2}$ transition of PtCl. Both electronic transitions were fit to a mass-independent Dunham type Hamiltonian using PGOPHER. Isotope dependent deviations from the Dunham model were observed due to both Born-Oppenheimer breakdown and field-shift effects resulting from differences in nuclear charge density between Pt-isotopes. The results of the analyses will be presented.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Permalink

http://hdl.handle.net/2142/104307

DOI

https://doi.org/10.15278/isms.2019.WJ02

Copyright and License Information

Copyright 2019 Jack C. Harms

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