Abstract
The electronic structure of small iron clusters is probed with size-selected anion photoelectron spectroscopy. The photoelectron spectra for Fe 9 − to Fe 16 − exhibit consistently sharp features near the threshold and their spectral changes correlate well with changes of their chemical reactivity. Extended Hückel calculations, based on body centered cubic structures for Fe 9 to Fe 16, provide a reasonable explanation of the experiment. These calculations also yield insights into the cluster magnetism and allow an interpretation of the cluster chemical reactivity based on their electronic structure.
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