Energy band dispersion in photoemission spectra of argon clusters

Förstel, Marko; Mucke, Melanie; Arion, Tiberiu; Lischke, Toralf; Barth, Silko; Ulrich, Volker; Öhrwall, Gunnar; Björneholm, Olle; Hergenhahn, Uwe; Bradshaw, Alexander M.

doi:doi:10.1016/j.elspec.2010.09.001

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Energy band dispersion in photoemission spectra of argon clusters

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Bradshaw, Alexander M.
Max-Planck-Institut für Plasmaphysik (IPP), EURATOM Association;
Theory, Fritz Haber Institute, Max Planck Society;

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Förstel, M., Mucke, M., Arion, T., Lischke, T., Barth, S., Ulrich, V., et al. (2011). Energy band dispersion in photoemission spectra of argon clusters. Journal of Electron Spectroscopy and Related Phenomena, 184(3-6), 107-112. doi:doi:10.1016/j.elspec.2010.09.001.

Cite as: http://hdl.handle.net/11858/00-001M-0000-0011-F321-4

Abstract

Using photoemission we have investigated free argon clusters from a supersonic nozzle expansion in the photon energy range from threshold up to 28 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 ≈1.5 eV broad 3p-derived valence band seen in previous work, there is a sharper feature at ≈15 eV binding energy. Surprisingly for non-oriented clusters, this peak shifts smoothly in binding energy over the narrow photon energy range 15.5–17.7 eV, indicating energy band dispersion. The onset of this bulk band-like behaviour could be determined from the cluster size dependence.