Surface Debye temperature of α-quartz (0001)

We present thermal attenuation measurements of scattered helium atoms from the surface of α-quartz (0001) which are analyzed using Debye theory. The Debye–Waller attenuation of the specular and the first order diffraction peak G11 is measured between 136K and 384K. Independent data sets are recorded...

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Bibliographic Details
Published in:Surface science 2008-03, Vol.602 (5), p.1080-1083
Main Authors: Steurer, W., Apfolter, A., Koch, M., Ernst, W.E., Holst, B.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Debye temperature
Exact sciences and technology
Helium atom scattering
Physics
Quartz
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Summary:We present thermal attenuation measurements of scattered helium atoms from the surface of α-quartz (0001) which are analyzed using Debye theory. The Debye–Waller attenuation of the specular and the first order diffraction peak G11 is measured between 136K and 384K. Independent data sets are recorded for beam energies of Ei=66.8meV and 96.3meV. The vibration amplitude at room temperature is estimated to be 0.011nm and agrees well with the simple model of reduced force constants by one-half at the surface. A surface Debye temperature of 360K is obtained for an effective vibrating mass of 22a.u.
ISSN:0039-6028
1879-2758
DOI:10.1016/j.susc.2008.01.003