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THE ELECTRONIC SPECTRA OF THE JET-COOLED BORON DIFLUORIDE (BF$_2$) AND BORON DICHLORIDE (BCl$_2$) FREE RADICALS

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/38085

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Title: THE ELECTRONIC SPECTRA OF THE JET-COOLED BORON DIFLUORIDE (BF$_2$) AND BORON DICHLORIDE (BCl$_2$) FREE RADICALS
Creators: Yang, Jie; Wei, Jie; Sunahori, Fumie; Gharaibeh, Mohammed; Ellis, Blaine; Chen, Alfred; Clouthier, Dennis J.; He, Sheng-Gui
Issue Date: 2009
Abstract: Laser-induced fluorescence (LIF) and single vibronic level (SVL) emission spectra of the $\~A^{2}\Pi_u-\~X^{2}A_1$ transitions of the jet-cooled boron difluoride (BF$_2$) and boron dichloride (BCl$_2$) radicals have been observed. In each case, the radical was produced in a pulsed discharge jet using a precursor mixture of the corresponding boron halide (BF$_3$ or BCl$_3$) in high pressure argon. Due to a large change in geometry from a bent ground state to a linear excited state, the LIF spectra are very extensive and the emission spectra show long bending progressions. Strong LIF bands of $^{11}$BF$_2$ and $^{10}$BF$_2$ (from isotopically enriched $^{10}$BF$_3$) were observed in the $29200-35100$ cm$^{-1}$ region and isotope shifts were identified. The rotational constants obtained from high resolution LIF spectra of the two isotopologues were used to determine the effective zero-point structure of the ground state. For BCl$_2$, weaker and much more complex LIF spectra, which have as yet defied vibrational analysis, were recorded in the $15300-22700$ cm$^{-1}$ region. SVL emission spectra of five isotopologues have been obtained, affording a detailed vibrational analysis of the ground state of BCl$_2$.
URI: http://hdl.handle.net/1811/38085
Other Identifiers: 2009-TJ-06
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