Honke, R. and Jakob, P. and Chabal, Y. J. and Dvorak, A. and Tausendpfund, S. and Stigler, W. and Pavone, P. and Mayer, A. P. and Schroeder, U. (1999) Anharmonic adlayer vibrations on the Si(111): H surface. PHYSICAL REVIEW B, 59 (16). pp. 10996-11013. ISSN 1098-0121, 1550-235X
Full text not available from this repository.Abstract
Using infrared absorption spectroscopy, the frequency and linewidth of the H-stretching vibration on the Si(111):H-(1x1) surface has been measured over a temperature range of 14-350 K. An ab initio calculation of the temperature dependence of the anharmonic frequency shift and the intrinsic linewidth of this mode has been carried out, which fully accounts for the quantum nature of the atomic vibrations by using interacting phonon theory. The theoretical results show that at temperatures greater than 200 K,both line shift and linewidth of the stretching mode are primarily due to strong anharmonic coupling to the bending modes, which suffer decay into substrate modes via cubic anharmonicity. At low temperatures, direct coupling to various phonon modes of the substrate dominates the temperature dependence of the line shift. In addition, predictions are made for the frequency shift due to zero-point motion of the atoms. A strong sensitivity of the frequency on the shape of the Si-H potential has been found that makes quantitative predictions of the influence of zero-point motion very difficult. As a byproduct, the temperature dependence of the interatomic distances near the surface has been obtained and a decrease of the H-SI distance with increasing temperature is predicted. [S0163-1829(99)02016-0].
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | H-TERMINATED SI(111); ADSORBATE-SUBSTRATE VIBRATION; ELECTRON-ENERGY-LOSS; MOLECULAR-DYNAMICS; VICINAL SI(111); SEMICONDUCTOR SURFACES; H/SI(111)1X1 SURFACE; HYDROGEN TERMINATION; STEPPED H/SI(111); BOUND-STATES; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 08 Nov 2022 09:21 |
| Last Modified: | 08 Nov 2022 09:21 |
| URI: | https://pred.uni-regensburg.de/id/eprint/48327 |
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