IRON CLUSTERS AND OXYGEN-CHEMISORBED IRON CLUSTERS

Lai-Sheng Wang, Jiawen Fan and Liang Lou
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Lai-Sheng Wang: Department of Physics, Washington State University, Richland, WA 99352, USA;
Jiawen Fan: Environmental Molecular Science Laboratory, Pacific Northwest Laboratory, MS K2–14, Richland, WA 99352, USA
Liang Lou: Rice Quantum Institute and Departments of Chemistry and Physics, Rice University, Houston, TX 77251, USA

Surface Review and Letters (SRL), 1996, vol. 03, issue 01, 695-699

Abstract: The photoelectron spectroscopy of size-selected${\rm{Fe}}_n^-$(n=3–24)clusters and oxygen-chemisorbed clustersFenO−(n=1–16), has been studied at 3.49-eV photon energy with a magnetic-bottle time-of-flight photoelectron spectrometer. While the spectra of the pure iron clusters show rather sharp features in the whole size range, those of the oxygen-chemisorbed species are considerably different, with extensive sharp structures observed for n only up to 6. The electron affinities (EAs) of both the bare and chemisorbed clusters exhibit strong size variations. However, the first oxygenation of the iron clusters induces a systematic lowering of EA in the size rangen=9–15. Towards a complete molecular picture of these interesting clusters, density-functional calculations are being performed to determine the equilibrium cluster structures, oxygen chemisorption sites, and their electronic structures. The equilibrium structures obtained forFenOwithn=2–6are reported.

Date: 1996
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DOI: 10.1142/S0218625X9600125X

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