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 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 Subject(s): Electronic structure, potential energy surfaces 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. Issue Date: 26-Jun-20 Publisher: International Symposium on Molecular Spectroscopy Citation Info: APS Genre: CONFERENCE PAPER/PRESENTATION Type: Text Language: English URI: http://hdl.handle.net/2142/107378 Date Available in IDEALS: 2020-06-26
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