A study of the H/W(110) adsorption system by surface reflectance spectroscopy

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Abstract
A method for the analysis of surface reflectance spectroscopy data is presented and applied to hydrogen chemisorbed on tungsten (110). This system is found to have highly anisotropic optical properties. The angular dependence of the more prominent features in the dielectric function is predicted for different structural models. The transition matrix elements are calculated with a tight-binding approximation after restricting the set of wave functions by using symmetry arguments and dipole-moment selection rules. A comparison with the experimental data determines the symmetry of the adsorbate wave functions and shows that the most likely adatom position is in a bridged site. The direct optical transitions are identified and the location of the resonance levels and adsorbate states in the surface band structure is determined.