University of Illinois Urbana-Champaign

Spectroscopic Constants And Potential Functions For The A3 Π1 And X1 Σ+ States Of Ibr By Using Merged Data Of Stark Spectroscopy

Nishimiya, Nobuo

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RL08_1.pdf
6397.pdf

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https://hdl.handle.net/2142/116840

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Title
Spectroscopic Constants And Potential Functions For The A3 Π1 And X1 Σ+ States Of Ibr By Using Merged Data Of Stark Spectroscopy
Author(s)
Nishimiya, Nobuo
Contributor(s)
  • Suzuki, Masao
  • Nomura, Katsuki
  • Yukiya, Tokio
Issue Date
2022-06-23
Keyword(s)
Structure determination
Abstract
The $A \leftarrow X$ electronic transition spectra of halogen diatomic molecules have been measured to determine the molecular constants and the parameters of potential energy by various researchers.\footnote{Selin et al, Ark. Fys. {\bf 21} (1962) 479.}$^{,}$\footnote{Coxon et al, JMS {\bf 79} (1983) 363, 380.}$^{,}$\footnote{Heddrich et al, JMS {\bf 79} (1992) 384.} \begin{wrapfigure}{r}[10pt]{0.3\textwidth} \centering \includegraphics[width=0.29\textwidth]{./starkIBr764.35nm-1.eps} \end{wrapfigure} In 2002, the Dunham coefficients of the $X$ state and rotation-vibration parameters of the $A$ state of IBr were determined by using the assigned line position of spectroscopic data in the range from $v'=3-20$ to $v''= 1-6$ and nuclear quadrupole coupling constants were also reported.\footnote{Yukiya et al, JMS {\bf 214} (2002) 132.} An anomalous fluctuations in the $v$ – dependence of the first differences of the inertial rotational constant, $\Delta B_v' = B_{v'+1} - B_v'$ in the $A^3\Pi_1$ was found more than $v= 19$ region. In 2015, we reported a new nonlinear direct potential fitting (DPF) analysis that uses ``robust'' nonlinear least-squares fits to average properly over the effect of such fluctuations in order to provide an optimum delineation of the underlying potential energy curve(s).\footnote{Le Roy, J.Quant.Spectorsc.Rad.Trans. {\bf 186}(2017) 179.} In the near dissociation limit, it would be difficult to assign the spectra, because in that area, too dense spectra would be observed. By adopting Stark spectroscopy, the relatively low $J$ spectra are emphasized and the high $J$ spectra become smaller as shown in the figure. This makes it easier to assign the low $J$ spectra even in dense regions. This work reports the spectroscopic constants refined and the parameters of potential energy curve recalculated.
Publisher
International Symposium on Molecular Spectroscopy
Type of Resource
text
Genre of Resource
Conference Paper / Presentation
Language
eng
Handle URL
https://hdl.handle.net/2142/116840
DOI
https://doi.org/10.15278/isms.2022.RL08
Copyright and License Information
Copyright 2022 held by the authors

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Abstracts & Presentations - 2022 International Symposium on Molecular Spectroscopy PRIMARY