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

Description

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

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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