R. Rosei | Università degli Studi di Trieste (original) (raw)
Papers by R. Rosei
Surface Science, 1994
... effect of oxygen on the growth and ordering of Rh-N chains PW Murray a, FM Leibsle a, G. Thor... more ... effect of oxygen on the growth and ordering of Rh-N chains PW Murray a, FM Leibsle a, G. Thornton a'1, M. Bowker a'2, VR Dhanak b'3, A ... The dark sections are one layer deep and are due to erosion of the terraces by consumption of Rh atoms for building 'added-row' structures. ...
Physical Review B, 1983
Single particle and collective excitations in the one-dimensional charge density wave solid K 0.3... more Single particle and collective excitations in the one-dimensional charge density wave solid K 0.3 MoO 3 probed in real time by femtosecond spectroscopy.
Physical Review B, 1997
Page 1. Order-disorder phase transitions of oxygen on Rh„100… A. Baraldi, VR Dhanak,* G. Comelli,... more Page 1. Order-disorder phase transitions of oxygen on Rh„100… A. Baraldi, VR Dhanak,* G. Comelli,† KC Prince, and R. Rosei† Sincrotrone Trieste SCpA, Padriciano 99, I-34012 Trieste, Italy Received 30 July 1996; revised manuscript received 21 February 1997 ...
A detailed experimental and theoretical investigation of the structure of nitric oxide adsorption... more A detailed experimental and theoretical investigation of the structure of nitric oxide adsorption layers formed at 140 K on Rh~100! has been carried out by means of x-ray photoelectron spectroscopy, x-ray photoelectron diffraction, near-edge x-ray absorption fine structure, and ab initio calculations. At saturation, a single NO species is present. Both theory and experimental results indicate a bridge adsorption site for NO in this phase, with the molecules standing upright on the surface. At low NO coverage, the presence of a different molecular species is experimentally revealed and it is fully characterized by ab initio calculations. This species has been identified with a NO molecule with the molecular axis almost parallel to the surface, lying above a Rh~100! hollow site with the two atoms in asymmetric bridge sites. © 2003 American Institute of Physics. @DOI: 10.1063/1.1627756#
Surface Science, 2000
In this letter we present a chemical shift photoelectron diffraction (CS-PED) study of the c(4×2)... more In this letter we present a chemical shift photoelectron diffraction (CS-PED) study of the c(4×2) phase of CO on Pt(111), in which two molecular species are present. The angular dependence of both chemically shifted C1s core levels was independently determined in a high resolution photoemission experiment. By means of a full multiple scattering analysis, the local structure around each of the two CO species has been quantitatively evaluated. A configuration with half of the CO molecules on top and half in the bridge position gives good agreement with the experimental data, in accord with previous structural studies of this system. Our result highlights the capabilities of CS-PED for the study of complex adsorption systems where the same molecule occupies different adsorption sites.
Surface and Interface Analysis, 1996
ABSTRACT
Physical Review Letters, 2004
In this Letter we show that sequences of adsorbate-induced shifts of surface core level (SCL) x-r... more In this Letter we show that sequences of adsorbate-induced shifts of surface core level (SCL) x-ray photoelectron spectra contain profound information on surface changes of electronic structure and reactivity. Energy shifts and intensity changes of time-lapsed spectral components follow simple rules, from which adsorption sites are directly determined. Theoretical calculations rationalize the results for transition metal surfaces in terms of the energy shift of the d-band center of mass and this proves that adsorbate-induced SCL shifts provide a spectroscopic measure of local surface reactivity.
![Research paper thumbnail of Structure of Rh&[;110&];(1x2) and Rh&[;110&]; (2x2)p2mg-O surfaces](https://attachments.academia-assets.com/45821728/thumbnails/1.jpg)
](Chemical Physics Letters, 1993
The structure of the oxygen-induced Rh{ 110) (2x 2)p2mg-O phase has been determined using low-ene... more The structure of the oxygen-induced Rh{ 110) (2x 2)p2mg-O phase has been determined using low-energy electron diffraction intensity-voltage (LEED 1-k') analysis, and consists of a missing row reconstructed substrate with oxygen atoms in a zigzag arrangement. The oxygen atoms occupy the upper threefold sites on the { 11 I} microfacets, and the nearest-neighbour bonding geometry is the same as for the (2x 1) oxygen-induced low-temperature phase. In spite of the similar geometries, the reactivities of these structures for CO oxidation are very different. When the oxygen is removed from the (2 ~2)p2mg surface at low temperature, the substrate retains the ( 1 x2) missing row reconstruction. LEED analysis of the (1 X 2) surface indicates that the first interlayer contraction is 1196, which is lower than the value determined previously by He scattering.
Applied Surface Science, 1993
ABSTRACT
Surface Science, 1994
... effect of oxygen on the growth and ordering of Rh-N chains PW Murray a, FM Leibsle a, G. Thor... more ... effect of oxygen on the growth and ordering of Rh-N chains PW Murray a, FM Leibsle a, G. Thornton a'1, M. Bowker a'2, VR Dhanak b'3, A ... The dark sections are one layer deep and are due to erosion of the terraces by consumption of Rh atoms for building 'added-row' structures. ...
Physical Review B, 1983
Single particle and collective excitations in the one-dimensional charge density wave solid K 0.3... more Single particle and collective excitations in the one-dimensional charge density wave solid K 0.3 MoO 3 probed in real time by femtosecond spectroscopy.
Physical Review B, 1997
Page 1. Order-disorder phase transitions of oxygen on Rh„100… A. Baraldi, VR Dhanak,* G. Comelli,... more Page 1. Order-disorder phase transitions of oxygen on Rh„100… A. Baraldi, VR Dhanak,* G. Comelli,† KC Prince, and R. Rosei† Sincrotrone Trieste SCpA, Padriciano 99, I-34012 Trieste, Italy Received 30 July 1996; revised manuscript received 21 February 1997 ...
A detailed experimental and theoretical investigation of the structure of nitric oxide adsorption... more A detailed experimental and theoretical investigation of the structure of nitric oxide adsorption layers formed at 140 K on Rh~100! has been carried out by means of x-ray photoelectron spectroscopy, x-ray photoelectron diffraction, near-edge x-ray absorption fine structure, and ab initio calculations. At saturation, a single NO species is present. Both theory and experimental results indicate a bridge adsorption site for NO in this phase, with the molecules standing upright on the surface. At low NO coverage, the presence of a different molecular species is experimentally revealed and it is fully characterized by ab initio calculations. This species has been identified with a NO molecule with the molecular axis almost parallel to the surface, lying above a Rh~100! hollow site with the two atoms in asymmetric bridge sites. © 2003 American Institute of Physics. @DOI: 10.1063/1.1627756#
Surface Science, 2000
In this letter we present a chemical shift photoelectron diffraction (CS-PED) study of the c(4×2)... more In this letter we present a chemical shift photoelectron diffraction (CS-PED) study of the c(4×2) phase of CO on Pt(111), in which two molecular species are present. The angular dependence of both chemically shifted C1s core levels was independently determined in a high resolution photoemission experiment. By means of a full multiple scattering analysis, the local structure around each of the two CO species has been quantitatively evaluated. A configuration with half of the CO molecules on top and half in the bridge position gives good agreement with the experimental data, in accord with previous structural studies of this system. Our result highlights the capabilities of CS-PED for the study of complex adsorption systems where the same molecule occupies different adsorption sites.
Surface and Interface Analysis, 1996
ABSTRACT
Physical Review Letters, 2004
In this Letter we show that sequences of adsorbate-induced shifts of surface core level (SCL) x-r... more In this Letter we show that sequences of adsorbate-induced shifts of surface core level (SCL) x-ray photoelectron spectra contain profound information on surface changes of electronic structure and reactivity. Energy shifts and intensity changes of time-lapsed spectral components follow simple rules, from which adsorption sites are directly determined. Theoretical calculations rationalize the results for transition metal surfaces in terms of the energy shift of the d-band center of mass and this proves that adsorbate-induced SCL shifts provide a spectroscopic measure of local surface reactivity.
Chemical Physics Letters, 1993
The structure of the oxygen-induced Rh{ 110) (2x 2)p2mg-O phase has been determined using low-ene... more The structure of the oxygen-induced Rh{ 110) (2x 2)p2mg-O phase has been determined using low-energy electron diffraction intensity-voltage (LEED 1-k') analysis, and consists of a missing row reconstructed substrate with oxygen atoms in a zigzag arrangement. The oxygen atoms occupy the upper threefold sites on the { 11 I} microfacets, and the nearest-neighbour bonding geometry is the same as for the (2x 1) oxygen-induced low-temperature phase. In spite of the similar geometries, the reactivities of these structures for CO oxidation are very different. When the oxygen is removed from the (2 ~2)p2mg surface at low temperature, the substrate retains the ( 1 x2) missing row reconstruction. LEED analysis of the (1 X 2) surface indicates that the first interlayer contraction is 1196, which is lower than the value determined previously by He scattering.
Applied Surface Science, 1993
ABSTRACT