We present the results of high-level ab initio calculations on the electron affinity of B2. Our new best estimate of 1.93 ± 0.03 eV is in agreement with previous calculations as well as the sole existing experimental estimate of 1.8 eV, as derived from quantities with an uncertainty of 0.4 eV. The electron affinity of atomic boron, which is much smaller, is also calculated for comparison and again found to be in good agreement with experiment.
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