Surface Carbonate on Ag{110}: an X-Ray Absorption Fine-Structure Study

Abstract

The surface carbonate species formed by the reaction of CO2 with preadsorbed oxygen on Ag{ l l O } has been studied with X-ray photoabsorption techniques. The analysis of the oxygen and carbon K near edge structure (NEXAFS) shows that the molecule is adsorbed flat on the surface and that, at least for the 0-resonances, the effective symmetry remains D3h. The observed (1 x 2) surface structure thus results from an adsorbate-induced reconstruction. The analysis of the extended fine structure (SEXAFS) gives an O-Ag bond length of 2.8A.

The local structure of molecular reaction intermediates at surfaces

“…This proved surprisingly sensitive to the azimuthal orientation of the molecule, but is not very sensitive to the tilt. Interestingly, earlier NEXAFS studies 54,55 had also indicated that the molecular plane is parallel to the surface, but with an estimated precision of only AE151. As may be seen in Fig.…”

Solid electrolyte interphase on graphite Li-ion battery anodes studied by soft X-ray spectroscopy

“…Two other dominating features are also found in all compounds at 285 eV and around 288.6 eV, although the relative intensity of the three peaks varies. The assignment of the features in the absorption spectra can be done in terms of the building block model, 24,25 and by comparison with published absorption spectra of various carbonates 26,27,24 and molecular orbital (MO) calculations. 28,29 The feature at 290.3 eV can be attributed to C1sp* transitions (C 2p-O 2p derived orbitals).…”

The hydration structure of aqueous carbonic acid from X-ray absorption spectroscopy

“…Until very recently, NEXAFS studies of the carbonate system were restricted to gaseous CO 2 [26], and to carbonates adsorbed to a surface [27] or in various solid mineral forms [28] by the difficulties then inherent in addressing liquid samples by this high vacuum technology. In 2011, we reported the first NEXAFS study of aqueous carbonate and bicarbonate ions [22], which was followed by an X-ray emission study in 2014 [29].…”