One-Dimension Chains of Structural Defects on the Surface of Sapphire and their Role in Adsorption of Alkali Atoms

A. M. Bonch-Bruevich, T. A. Vartanyan, Yu. N. Maksimov, S. G. Przhibelskii and V. V. Khromov
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A. M. Bonch-Bruevich: State Optical Institute, St. Petersburg 199034, Russia
T. A. Vartanyan: State Optical Institute, St. Petersburg 199034, Russia
Yu. N. Maksimov: State Optical Institute, St. Petersburg 199034, Russia
S. G. Przhibelskii: State Optical Institute, St. Petersburg 199034, Russia
V. V. Khromov: State Optical Institute, St. Petersburg 199034, Russia

Surface Review and Letters (SRL), 1998, vol. 05, issue 01, 331-335

Abstract: Alkali adsorption on the (0001) surface of the monocrystallineα-Al2O3was studied by means of laser-simulated desorption. It was found that alkali atoms are adsorbed mostly on the centers with the surface concentration of about1013 cm-2. Although the temperature dependence of surface coverage is consistent with the conventional Langmuir model for adsorption on the isolated centers, the estimated adsorption energy of about 1 eV is too large to account for the quantum yield of the photodesorption process, which is as high as5 ×10-5. To resolve this contradiction we assumed that adsorption centers make up chains along the steps on the surface. Lateral interactions between neighboring adatoms were accounted for by means of methods developed for the Ising model. Theoretical results are in agreement with the experiment.

Date: 1998
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DOI: 10.1142/S0218625X9800061X

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