The Electronic Spectra of the Jet-Cooled Boron Difluoride (BF_2) and Boron Dichloride (BCl_2) Free Radicals

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Laser-induced fluorescence (LIF) and single vibronic level (SVL) emission spectra of the Ã^{2}Π_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.

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