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The absorption spectra of the fundamental bands of the free radicals 10B16O and 11B16O in their ground 2Σ+ states have been measured in natural abundance and at Doppler limited resolution using diode laser spectroscopy. The band origins are found to be 1915.30674(14) and 1861.92409(13) cm−1, respectively. The rotational constants for the lower states are 1.877680(22) and 1.773421(10) cm−1, which are in excellent agreement with the microwave values for B0. Assuming a linear dependence of Bv on (v+1/2) the derived value of re is 1.204552(5) A˚. [Copyright &y& Elsevier]