Surface anharmonicity. Temperature dependence of phonon energies on Cu(110)

A. P. Baddorf; E. W. Plummer

doi:10.1016/0368-2048(90)80246-7

Surface anharmonicity. Temperature dependence of phonon energies on Cu(110)

A. P. Baddorf, E. W. Plummer

Scanning Tunneling Microscopy Group

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17 Scopus citations

Abstract

The temperature dependence of surface phonons on Cu(110) has been determined with high resolution electron energy loss Spectroscopy between 21 and 766 K. Phonons at \ ̄gG and at Ȳ, both with atomic motion perpendicular to the surface, have been examined to assess the importance of anharmonicity at the surface. As the temperature is increased the observed phonon energies decrease and the Iinewidths increase. The same percentage decrease is observed at \ ̄gG and Ȳ. A simple model using an anharmonic potential can reproduce the magnitude and shape of the temperature dependence of the phonon at \ ̄gG. Direct comparison with bulk phonon studies shows that the anharmonicity at the surface is 4.1-4.8 times greater.

Original language	English
Pages (from-to)	541-550
Number of pages	10
Journal	Journal of Electron Spectroscopy and Related Phenomena
Volume	54-55
Issue number	C
DOIs	https://doi.org/10.1016/0368-2048(90)80246-7
State	Published - 1990

Funding

We are grateful for constructive discussions with David Zehner, Mark Mostoller, and John Wendelken. This work has been supported by the National Science Foundation through grant No. DMR-89-03306 and by the Department of Energy under contract DE-AC05-840R21400 with Martin Marietta Energy Systems, Inc.

Funders	Funder number
National Science Foundation	DMR-89-03306
U.S. Department of Energy	DE-AC05-840R21400

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title = "Surface anharmonicity. Temperature dependence of phonon energies on Cu(110)",

abstract = "The temperature dependence of surface phonons on Cu(110) has been determined with high resolution electron energy loss Spectroscopy between 21 and 766 K. Phonons at \{\= }gG and at Ȳ, both with atomic motion perpendicular to the surface, have been examined to assess the importance of anharmonicity at the surface. As the temperature is increased the observed phonon energies decrease and the Iinewidths increase. The same percentage decrease is observed at \{\= }gG and Ȳ. A simple model using an anharmonic potential can reproduce the magnitude and shape of the temperature dependence of the phonon at \{\= }gG. Direct comparison with bulk phonon studies shows that the anharmonicity at the surface is 4.1-4.8 times greater.",

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AU - Baddorf, A. P.

AU - Plummer, E. W.

PY - 1990

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N2 - The temperature dependence of surface phonons on Cu(110) has been determined with high resolution electron energy loss Spectroscopy between 21 and 766 K. Phonons at \ ̄gG and at Ȳ, both with atomic motion perpendicular to the surface, have been examined to assess the importance of anharmonicity at the surface. As the temperature is increased the observed phonon energies decrease and the Iinewidths increase. The same percentage decrease is observed at \ ̄gG and Ȳ. A simple model using an anharmonic potential can reproduce the magnitude and shape of the temperature dependence of the phonon at \ ̄gG. Direct comparison with bulk phonon studies shows that the anharmonicity at the surface is 4.1-4.8 times greater.

AB - The temperature dependence of surface phonons on Cu(110) has been determined with high resolution electron energy loss Spectroscopy between 21 and 766 K. Phonons at \ ̄gG and at Ȳ, both with atomic motion perpendicular to the surface, have been examined to assess the importance of anharmonicity at the surface. As the temperature is increased the observed phonon energies decrease and the Iinewidths increase. The same percentage decrease is observed at \ ̄gG and Ȳ. A simple model using an anharmonic potential can reproduce the magnitude and shape of the temperature dependence of the phonon at \ ̄gG. Direct comparison with bulk phonon studies shows that the anharmonicity at the surface is 4.1-4.8 times greater.

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JO - Journal of Electron Spectroscopy and Related Phenomena

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ER -

Surface anharmonicity. Temperature dependence of phonon energies on Cu(110)

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