Adsorption site, orientation and alignment of NO adsorbed on Au(100) using 3D-velocity map imaging, X-ray photoelectron spectroscopy and density functional theory

Abstract

Molecular surface geometry of adsorbents by triangulation using 3D-velocity map imaging.

Study of odd–even effects in physisorption and chemisorption of Ar, N2, O2and NO on open shell Ag11–13+clusters by means of self-consistent van der Waals density functional calculations

“…It is known that NO adsorbs on the bridge site of Au(100), which ensures efficient overlap of the NO p* orbital with the orbitals of the two neighbouring noble metal atoms, and with the NO bond axis aligned along the surface normal. 60 In a recent DFT study of NO adsorption on M n neutral clusters (M = Ru, Rh, Pd, Ag; n = 13, 55), 61 Firstly, the optimized geometries of Ag 11-13 + clusters show distinctive motifs in their generation, depending on an odd or even number of atoms. That motif is a pentagonal bipyramid for odd n and a triangular prism for even n. This fact is of relevance to rationalize the geometrical effects in the adsorption of Ar and N 2 molecules, which is ruled by physisorption interactions.…”

Nitric Oxide Scattering off Graphene Using Surface-Velocity Map Imaging

“…We note that the narrow scattering distribution is not an artifact of the geometry of our VMI instrument. Since the ionization laser for NO (1 + 1) REMPI spectroscopy does not need to be focused, we can detect all NO molecules that scatter within a polar angle of 14°, and the majority of the ionized molecules would follow true VMI conditions due to us using soft extraction conditions with 12 plates . However, it is due to the narrow angular distribution in the experiment, see Figure , that we can detect all scattered NO molecules under true VMI conditions.…”

“…Our surface-VMI apparatus has been described previously, , but a number of key features and changes warrant a more detailed description. The spectrometer consists of two vacuum chambers, the first housing the molecular beam (firing vertically downward in the lab frame), and the second chamber houses the graphene surface on a gold substrate, together with the 12 VMI optics plates and the multichannel plate (MCP) detector/phosphor screen assembly.…”

Copper Doping Promotion on Ce/CAC-CNT Catalysts with High Sulfur Dioxide Tolerance for Low-Temperature NH3–SCR

“…The N 1s spectra in Figure b had four peaks at the binding energies of 398.6, 400.7, 402.6, and 405.8 eV. The two peaks at 400.7 and 405.8 eV were ascribed to the N–H structure of adsorbed NH 3 and gaseous NO . After the SO 2 feed was off, the Cu 0.2 Ce/CAC-CNTs showed a recovery in the SCR activity.…”

“…The two peaks at 400.7 and 405.8 eV were ascribed to the N−H structure of adsorbed NH 3 59 and gaseous NO. 60 After the SO 2 feed was off, the Cu 0.2 Ce/CAC-CNTs showed a recovery in the SCR activity. This is because the formed sulfate species could bond with Ce 4+ , promoting surface NH 3 adsorption.…”