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Geometrical and electronic structures of the neutral and singly negatively charged Fe6On and Fe7Om clusters in the range of 1 ≤ n ≤ 20 and 1 ≤ m ≤ 24, respectively, are computed using density functional theory with the generalized gradient approximation. The largest clusters in the two series, Fe6O20 and Fe7O24, can be described as Fe(FeO4)5 and Fe(FeO4)6 or alternatively as [FeO5](FeO3)5 and [FeO...
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