Abstract
A b initio multireference configuration interaction calculations yield an electron affinity of 0.604±0.03 eV for methylene (3B1), in excellent agreement with the best observed value of 0.628±0.031 eV. The estimated theoretical error limit of 0.03 eV is based on energy convergence with respect to systematic expansion of both reference configuration space and one-particle basis set. Convergence to the full CI electron affinity is rapid, and significantly accelerated when corrections for quadruple electron excitations are included.
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