Abstract
The ν1 band of ClBO has been recorded using infrared diode laser spectroscopy. The molecule was produced by reacting oxygen atoms, produced in a microwave discharge containing an O2/He mixture, with BCl3. Thirty-three lines of the 35Cl11B16O isotopomer and 32 lines due to the 37Cl11B16O isotopomer have been assigned. By fixing the ground state constants to those previously obtained by microwave spectroscopy, a least-squares fit (rms = 0.0008) gave the following upper state constants; 35Cl11B16O: ν0 = 1972.18024(21) cm−1, B1 = 0.1725055(12) cm−1; 37Cl11B16O: ν0 = 1971.82846(24) cm−1, B1 = 0.1688402(13) cm−1. The rotational constants of all the fundamental bands of ClBO have been used to calculate an re structure yielding re(B–Cl) = 167.668(26) pm and re(B–O) = 121.308(26) pm.
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