Interaction of NO with clean and K-dosed Rh(111) surfaces. II. EELS and PES studies

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Abstract

The interaction of NO with clean and potassium covered Rh(111) surfaces has been investigated by means of EELS (in the electronic range), UPS and XPS. The appearance of the O 2p signal at 6.0 eV in UPS indicates the dissociation of NO at low coverage on the clean surface at 300 K. At high exposures the adsorption is preferentially molecular. In the presence of a potassium adlayer the thermal stability of adsorbed NO depended on the potassium coverage. At low K coverage the potassium promotes the dissociation due to enhanced back-donation from the d-orbitals of Rh into the 2π orbital of NO. At monolayer K coverage, the UPS and XPS spectra suggest an appreciable stabilization of NO; the dissociation started at 400-422 K. Above 422 K, the appearance of new photoemission signals at 4.0, 9.8 and 11.7 eV in UPS, and at 403.8 and 533.7 eV in XPS suggest the formation of NO2 species stabilized by potassium. This surface complex decomposes on Rh(111) at around 664 K.

Original languageEnglish
Pages (from-to)1-11
Number of pages11
JournalSurface Science
Volume233
Issue number1-2
DOIs
Publication statusPublished - Jul 1 1990

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Electron energy loss spectroscopy
Potassium
potassium
X ray photoelectron spectroscopy
dissociation
interactions
orbitals
Photoemission
Monolayers
Thermodynamic stability
thermal stability
photoelectric emission
Stabilization
stabilization
Adsorption
adsorption
electronics

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces

Cite this

Interaction of NO with clean and K-dosed Rh(111) surfaces. II. EELS and PES studies. / Bugyi, L.; Kiss, J.; Révész, K.; Solymosi, F.

In: Surface Science, Vol. 233, No. 1-2, 01.07.1990, p. 1-11.

Research output: Contribution to journalArticle

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abstract = "The interaction of NO with clean and potassium covered Rh(111) surfaces has been investigated by means of EELS (in the electronic range), UPS and XPS. The appearance of the O 2p signal at 6.0 eV in UPS indicates the dissociation of NO at low coverage on the clean surface at 300 K. At high exposures the adsorption is preferentially molecular. In the presence of a potassium adlayer the thermal stability of adsorbed NO depended on the potassium coverage. At low K coverage the potassium promotes the dissociation due to enhanced back-donation from the d-orbitals of Rh into the 2π orbital of NO. At monolayer K coverage, the UPS and XPS spectra suggest an appreciable stabilization of NO; the dissociation started at 400-422 K. Above 422 K, the appearance of new photoemission signals at 4.0, 9.8 and 11.7 eV in UPS, and at 403.8 and 533.7 eV in XPS suggest the formation of NO2 species stabilized by potassium. This surface complex decomposes on Rh(111) at around 664 K.",
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N2 - The interaction of NO with clean and potassium covered Rh(111) surfaces has been investigated by means of EELS (in the electronic range), UPS and XPS. The appearance of the O 2p signal at 6.0 eV in UPS indicates the dissociation of NO at low coverage on the clean surface at 300 K. At high exposures the adsorption is preferentially molecular. In the presence of a potassium adlayer the thermal stability of adsorbed NO depended on the potassium coverage. At low K coverage the potassium promotes the dissociation due to enhanced back-donation from the d-orbitals of Rh into the 2π orbital of NO. At monolayer K coverage, the UPS and XPS spectra suggest an appreciable stabilization of NO; the dissociation started at 400-422 K. Above 422 K, the appearance of new photoemission signals at 4.0, 9.8 and 11.7 eV in UPS, and at 403.8 and 533.7 eV in XPS suggest the formation of NO2 species stabilized by potassium. This surface complex decomposes on Rh(111) at around 664 K.

AB - The interaction of NO with clean and potassium covered Rh(111) surfaces has been investigated by means of EELS (in the electronic range), UPS and XPS. The appearance of the O 2p signal at 6.0 eV in UPS indicates the dissociation of NO at low coverage on the clean surface at 300 K. At high exposures the adsorption is preferentially molecular. In the presence of a potassium adlayer the thermal stability of adsorbed NO depended on the potassium coverage. At low K coverage the potassium promotes the dissociation due to enhanced back-donation from the d-orbitals of Rh into the 2π orbital of NO. At monolayer K coverage, the UPS and XPS spectra suggest an appreciable stabilization of NO; the dissociation started at 400-422 K. Above 422 K, the appearance of new photoemission signals at 4.0, 9.8 and 11.7 eV in UPS, and at 403.8 and 533.7 eV in XPS suggest the formation of NO2 species stabilized by potassium. This surface complex decomposes on Rh(111) at around 664 K.

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