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Title:Isotope Shift In Optical Spectra Of Moo Molecule
Author(s):Zhang, Lei
Contributor(s):Yang, Jie; Yu, Yao
Subject(s):Mini-symposium: Precision Spectroscopy for Fundamental Physics
Abstract:\begin{wrapfigure}{l}{0pt} \includegraphics[scale=0.57]{Figure.eps} \end{wrapfigure} The jet-cooled molybdenum monoxide (MoO) molecule involving seven natural isotopologues from $^{92}$MoO $(14.5\%)$, $^{94}$MoO $(9.2\%)$, $^{95}$MoO $(15.8\%)$, $^{96}$MoO $(16.7\%)$, $^{97}$MoO $(9.6\%)$, $^{98}$MoO $(24.4\%)$, and $^{100}$MoO $(9.8\%)$, have been investigated with the laser-induced fluorescence (LIF) excitation spectra and the single vibronic level (SVL) emission spectra in the energy range from 13 800 to 16 500 cm$^{-1}$. Four rotationally resolved transition bands near 14 107, 14 144, 14 237, and 15 034 cm$^{-1}$ have been observed, and exhibit extremely large isotope shifts, in which the largest shift is 53 cm$^{-1}$ for $\nu(^{92}\rm{MoO})-\nu(^{100}\rm{MoO})$. By rotational analysis, the four bands all originate from the \emph{X} $^5\Pi_{-1}$ ground state, and are assigned as the $6-0$, $7-0$, $6-0$, and $9-0$ $(\rm{v^{\prime}}-\rm{v^{\prime\prime}})$ bands of the $\Omega^{\prime}=2\leftarrow\Omega^{\prime\prime}=-1$ transition according to the vibrational isotope shift. In addition, the isotopologues-resolved SVL emission spectra have been obtained by fixing the excitation laser at Q-branch bandhead of the transition. The isotope shifts in the vibrational $\rm{v}^{\prime\prime}=$ 0, 1, 2, and 3 levels of the \emph{X}$^5\Pi_{-1}$ ground state have been observed and show well agreement with the calculation from the model of harmonic vibration. The solid experimental results are consistent with the theoretical prediction, which indicates that the works on MoO are of great benchmark to reveal the role of the isotope shift in the vibrational levels of simple molecules.
Issue Date:2021-06-24
Publisher:International Symposium on Molecular Spectroscopy
Genre:Conference Paper / Presentation
Date Available in IDEALS:2021-09-24

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