A synergistic approach that combines first-principles theory and electron photodetachment experiment is shown to be able to uniquely identify the ground state of a nearly degenerate cluster in the gas phase. Additionally, this approach can complement the Stern-Gerlach technique in determining the magnetic moment of small clusters unambiguously. The method, applied to a Fe₃ cluster, reveals its ground state to have a magnetic moment of 10μB---in contrast with earlier predictions.
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Gutsev et al. (2000) studied this question.
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