Linewidths in bound state resonances for helium scattering from Si(111)-(1x1)H

Tuddenham, F.E., Hedgeland, H., Knowling, J., Jardine, A.P., MacLaren, D.A. , Alexandrowicz, G., Ellis, J. and Allison, W. (2009) Linewidths in bound state resonances for helium scattering from Si(111)-(1x1)H. Journal of Physics: Condensed Matter, 21(26), (doi:10.1088/0953-8984/21/26/264004)

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Publisher's URL: http://dx.doi.org/10.1088/0953-8984/21/26/264004

Abstract

Helium-3 spin-echo measurements of resonant scattering from the Si(111)–(1 × 1)H surface, in the energy range 4–14 meV, are presented. The measurements have high energy resolution yet they reveal bound state resonance features with uniformly broad linewidths. We show that exact quantum mechanical calculations of the elastic scattering, using the existing potential for the helium/Si(111)–(1 × 1)H interaction, cannot reproduce the linewidths seen in the experiment. Further calculations rule out inelastic and other mechanisms that might give rise to losses from the elastic scattering channels. We show that corrugation in the attractive part of the atom–surface potential is the most likely origin of the experimental lineshapes.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:MacLaren, Dr Donald
Authors: Tuddenham, F.E., Hedgeland, H., Knowling, J., Jardine, A.P., MacLaren, D.A., Alexandrowicz, G., Ellis, J., and Allison, W.
Subjects:Q Science > QC Physics
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Journal of Physics: Condensed Matter
Journal Abbr.:J. Phys.: Condens. Matter
Publisher:IOP Publishing Ltd
ISSN:0953-8984
ISSN (Online):1361-648X
Copyright Holders:Copyright © 2009 IOP Publishing Ltd
First Published:First published in Journal of Physics Condensed Matter 21(26)
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher.

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