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Journal Article

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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Citation

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.