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Science 17 October 1986:
Vol. 234. no. 4774, pp. 316 - 322
DOI: 10.1126/science.234.4774.316
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Articles

Electron- and Photon-Stimulated Desorption: Probes of Structure and Bonding at Surfaces

THEODORE E. MADEY 1

1 NBS fellow in the Surface Science Division at the National Bureau of Standards, Gaithersburg, MD 20899.

Techniques for analyzing the structure and composition of solid surfaces with electron and photon beams often cause radiation damage in samples. Damage-producing processes compete with information-producing events during measurements, and beam damage can be a serious perturbation in quantitative surface analysis. There are, however, substantial benefits of electron- and photonstimulated damage processes for studying molecules adsorbed on surfaces. Direct information about the geometric structure of surface molecules can be obtained from measurements of the angular distributions of ions released by electron- or photon-stimulated desorption. The directions of ion emission are determined by the orientation of the surface bonds that are ruptured by beam irradiation. Moreover, photon-stimulated desorption studies that make use of synchrotron radiation reveal the fundamental electronic excitations that lead to bondbreaking processes at surfaces. These measurements provide new insights into radiation-damage processes in areas as diverse as x-ray optics and semiconductor electronics.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Electron-Induced Oxygen Desorption from the TiO2(011)-2x1 Surface Leads to Self-Organized Vacancies.
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Direct Observation of Chemical Bond Dynamics on Surfaces.
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