Observation And Spectral Analysis Of The <i>a</i> &#8486;=1 – <i>x</i> &#8486;=0⁺ Electronic Transition Of Diatomic Platinum Sulfide, Pts, By Intracavity Laser Absorption Spectroscopy With Fourier Transform Detection (ils-fts)

O'Brien, Leah C

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https://hdl.handle.net/2142/111593 Copy

Description

Title

Observation And Spectral Analysis Of The a Ω=1 – x Ω=0⁺ Electronic Transition Of Diatomic Platinum Sulfide, Pts, By Intracavity Laser Absorption Spectroscopy With Fourier Transform Detection (ils-fts)

Author(s)

O'Brien, Leah C

Contributor(s)

• Zou, Wenli
• O'Brien, James J
• Harms, Jack C

Issue Date

2021-06-25

Keyword(s)

Small molecules

Abstract

Using ILS-FTS, we have recorded the $\it{A}$ $\Omega$=1 – $\it{X}$ $\Omega$=0$^{+}$ transition of diatomic PtS. Strong bands were observed at 15,520 and 15,910 \wn, which have been identified as the (0,0) and (1,0) vibrational bands. The P- and R-branches show a regular pattern for the $^{194}$PtS, $^{195}$PtS, $^{196}$PtS and $^{198}$PtS isotopologues, but quite interestingly the Q-branch shows significant hyperfine splitting for $^{195}$PtS. Although P- and R-branches were easily assigned based on the known ground state constants, the Q-branch seems to be perturbed, requiring q, q$_{D}$, and q$_{H}$ parameters to achieve only a sub-par fit. This indicates the presence of a nearby $\Omega$=0$^{-}$ state that is perturbing the $\it{f}$–levels in the $\it{A}$ $\Omega$=1 state. A successful deperturbation analysis and fit were performed in PGOPHER, and molecular constants for the $\it{A}$ $\Omega$=1 and perturbing $\Omega$=0$^{-}$ states were obtained. High-level $\it{ab\, initio}$ calculations support this assignment and predict an $\Omega$=0$^{-}$ state in close proximity to the $\it{A}$ state. Results and discussion of this analysis will be presented.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

Text

Language

eng

Permalink

http://hdl.handle.net/2142/111593

DOI

10.15278/isms.2021.FL03

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