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By G.A. Somorjai, M.A. van Hove

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8. Not only is hydrogen readily detectable at coverages much less than a monolayer, but the isotope shifts on account of the different masses of H and D are also observed. The peaks are narrow and of high intensity and yield information on the location and structural symmetry of the sites where the surface atoms molecules are located. 05 \ e-o9 @-0 L 510 ' 1dO ' 150 ' I 200 Fig. 8. High-resolution electron energy loss spectra for H and D adsorbed atomically on W(100). The elastic peak is shown at left.

0D can be obtained experimentally for a surface through measurement of the Debye-Waller factor and typical results are shown in Fig. 4: the experimental 0 D is observed to vary irregularly with the LEED electron energy, tending at high energies to a constant that lies in the neighborhood of the value of 0D for the inside of the crystal. The Debye temperature 0D, being a material constant, should not depend on characteristics of the probe used to measure it (here the electron energy). The interpretation of this anomalous behavior is the following.

Thus, the structure of the different adsorption sites that are filled up successively with increasing coverage of the adsorbate, can all be detected. There is a wealth of surface structural information that is becoming available from the high resolution electron loss spectra of adsorbed hydrocarbons and other molecules. ). Hydrogen cannot be readily detected by other techniques such as LEED or other electron spectroscopies because of its small elastic and inelastic cross sections for scattering.

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