LASER SPECTROSCOPY OF YBr: ROTATIONAL ANALYSIS OF THE $C^{1}\Sigma - X^{1}\Sigma$ SYSTEM

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2001

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Ohio State University

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The $C^{1}\Sigma - X^{1}\Sigma$ system of YBr has been studied using a laser vaporisation/reaction free jet expansion source coupled with laser induced fluorescence spectrometer. YBr molecule was generated by ablating a yttrium rod in the presence of $C_{2}H_{5}Br$ vapour. Laser induced fluorescence spectrum of the $C^{1}\Sigma - X^{1}\Sigma$ system recorded consists of the (0,0), (0,1), (0,2), (0,3), (1,2), (1,3), (1,4) and (2,4) bands. Each band displays the typical R and P branches, which is characterisation of a $^{1}\Sigma - ^{1}\Sigma$ transition. Transition lines of both the $Y^{79}Br$ and $Y^{81}Br$ were observed and analysed. Least squares fit of all the available lines of each isotopic molecule was performed. Molecular constants of $Y^{79}Br$ and $Y^{81}Br$ will be reported. Acknowledgement: This work was carried out with support from the Hong Kong Research Grants Council.

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Author Institution: Department of Chemistry, The University of Hong Kong; Department of Chemistry, The University of Hong Kong

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