Surface reflectance spectroscopy on low-index planes of tungsten

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Abstract
The fractional changes in optical reflectance for s and p polarization, ΔRs/Rs and ΔRp/Rp, have been determined for the adsorption of H2, O2, and CO on the low-index planes of W. Structure in the spectra of ΔRs/Rs and ΔRp/Rp are very similar, implying that the microscopic corrections to the classical equations for ΔRp/Rp are small for photon energies 0.5–4.5 eV. Similarities in the spectra for the chemisorption of the different adsorbates on W(111) imply that the main effect is due to the mere presence of the adsorbate, rather than the identity of the adsorbate. It is possible that this lack of specificity can be explained by a surface relaxation upon chemisorption.

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