Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5396454 | Journal of Electron Spectroscopy and Related Phenomena | 2011 | 6 Pages |
Abstract
Using photoemission we have investigated free argon clusters from a supersonic nozzle expansion in the photon energy range from threshold up to 28Â eV. Measurements were performed both at high resolution with a hemispherical electrostatic energy analyser and at lower resolution with a magnetic bottle device. The latter experiments were performed for various mean cluster sizes. In addition to the â1.5Â eV broad 3p-derived valence band seen in previous work, there is a sharper feature at â15Â eV binding energy. Surprisingly for non-oriented clusters, this peak shifts smoothly in binding energy over the narrow photon energy range 15.5-17.7Â eV, indicating energy band dispersion. The onset of this bulk band-like behaviour could be determined from the cluster size dependence.
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Authors
Marko Förstel, Melanie Mucke, Tiberiu Arion, Toralf Lischke, Silko Barth, Volker Ulrich, Gunnar Ãhrwall, Olle Björneholm, Uwe Hergenhahn, Alex M. Bradshaw,