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Observation of a new phase on the hydrogen terminated diamond (111)-surface by helium atom scattering

Published online by Cambridge University Press:  10 February 2011

G. Lange† ,
Th. Schaich ,
J. P. Toennies†  and
Ch. Wöll
G. Lange†
Affiliation:
Max-Planck-Institut für Strömungsforschung, Bunsenstr. 10, 37073 Göttingen, Germany
Th. Schaich
Affiliation:
Angewandte Physikalische Chemie, Universität Heidelberg, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany
J. P. Toennies†
Affiliation:
Max-Planck-Institut für Strömungsforschung, Bunsenstr. 10, 37073 Göttingen, Germany
Ch. Wöll
Affiliation:
Max-Planck-Institut für Strömungsforschung, Bunsenstr. 10, 37073 Göttingen, Germany
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Abstract

The structural phase diagram of the hydrogen terminated diamond-(111) surface, which is of considerable relevance with regard to the low-pressure synthesis of diamond, has been investigated by the highly surface sensitive technique of thermal energy helium atom scattering. A new phase with a (2 × 1) symmetry has been observed to occur upon heating above 940 K, significantly below the well known transition to the hydrogen-free (2 × 1) π-bonded chain structure at 1250 K. It is proposed that the new phase consists of a hydrogen (2 × 1) overlayer on an unreconstructed (1 × 1) diamond substrate. Structural models for this new phase will be presented.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 416: Symposium DD – Diamond for Electronic Applications , 1995 , 275
Copyright
Copyright © Materials Research Society 1996

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References

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