Na-induced bonding and bond-length changes for CO on Pt(111): A near-edge x-ray-absorption fine-structure study

In-situ soft X-ray studies of CO oxidation on the Pt(111) surface

“…In contrast, in the glancing (30°) incidence spectrum (data not shown) a large r * peak is located at 303.0 eV, and the p * peak at 287.8 eV has decreased in intensity relative to the step edge. Together, these results confirm that CO is adsorbed perpendicular to the surface [29]. As observed in the left panel of the figure, there are no resonances near 330.0 eV.…”

Reappraisal of the Existence of Shape Resonances in the SeriesC2H2,C<

“…The two descriptions are essentially equivalent, as has been discussed in several papers, e.g., [5]. Conforming with the notion that the energy of a shape resonance depends on the details of the molecular potential, Stöhr, Sette, Hitchcock, and others have suggested that there is a correlation between shape resonance position and bond length, even in polyatomic molecules [6][7][8][9][10]. Piancastelli et al [11,12] later pointed out that, although such a "bond lengths with a ruler" [8] correlation might be expected (see, e.g., [13]), there were assignment problems in photoabsorption spectra and it was suggested that shape resonances should actually be sought in the corresponding main line, or single hole, cross sections.…”

Reaction-path switching induced by spatial-distribution change of reactants: CO oxidation on Pt(111)

“…Experiments were performed by the titration method. A peak observed at 530 eV, which decreases with time, corresponds to the surface atomic O, 18 while a growing peak at 534 eV is ascribed to the adsorbed CO. 19 By curve-fitting analyses we obtained coverage changes of O and CO as a function of time. Figure 1 shows a typical series of the spectra in the dispersive mode taken every 37 s for the CO oxidation reaction.…”