Structure and properties of potassium on Pd(100) surface

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Abstract

The adsorption of K on Pd(100) was investigated using LEED, EELS, work function and thermal desorption measurements. Adsorbed potassium on Pd(100) formed two well-ordered structures, p(2×2) at θK=0.25, and c(2×2) at monolayer coverage. This latter corresponds to a surface concentration of 6.7×1014 K atoms/cm2. The work function of Pd decreased to a minimum at a coverage of 2.7×1014 K atoms/cm2 and then increased toward the value of metallic potassium. The metallization began at∼1.5 monolayer. The activation energy of desorption decreased from 240 kJ/mol at zero coverage to 108 kJ/mol for monolayer coverage. Adsorption of K on Pd(100) produced four loss features (at 19.4, 18.4, 3.5 and 2.6 eV) in the EEL spectrum which were attributed to K(3p)→K(4s), K(3p)→Pd Fermi level, Pd d-band→K(4s) electron transitions and to a s-derived plasmon loss in metallic potassium.

Original languageEnglish
Pages (from-to)359-371
Number of pages13
JournalSurface Science
Volume187
Issue number2-3
DOIs
Publication statusPublished - Sep 1 1987

Fingerprint

Potassium
Monolayers
potassium
desorption
Adsorption
Atoms
Thermal desorption
adsorption
Electron energy loss spectroscopy
electron transitions
Electron transitions
Metallizing
Fermi level
atoms
Desorption
Activation energy
activation energy

ASJC Scopus subject areas

  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Condensed Matter Physics
  • Surfaces and Interfaces

Cite this

Structure and properties of potassium on Pd(100) surface. / Berkó, A.; Solymosi, F.

In: Surface Science, Vol. 187, No. 2-3, 01.09.1987, p. 359-371.

Research output: Contribution to journalArticle

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abstract = "The adsorption of K on Pd(100) was investigated using LEED, EELS, work function and thermal desorption measurements. Adsorbed potassium on Pd(100) formed two well-ordered structures, p(2×2) at θK=0.25, and c(2×2) at monolayer coverage. This latter corresponds to a surface concentration of 6.7×1014 K atoms/cm2. The work function of Pd decreased to a minimum at a coverage of 2.7×1014 K atoms/cm2 and then increased toward the value of metallic potassium. The metallization began at∼1.5 monolayer. The activation energy of desorption decreased from 240 kJ/mol at zero coverage to 108 kJ/mol for monolayer coverage. Adsorption of K on Pd(100) produced four loss features (at 19.4, 18.4, 3.5 and 2.6 eV) in the EEL spectrum which were attributed to K(3p)→K(4s), K(3p)→Pd Fermi level, Pd d-band→K(4s) electron transitions and to a s-derived plasmon loss in metallic potassium.",
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AB - The adsorption of K on Pd(100) was investigated using LEED, EELS, work function and thermal desorption measurements. Adsorbed potassium on Pd(100) formed two well-ordered structures, p(2×2) at θK=0.25, and c(2×2) at monolayer coverage. This latter corresponds to a surface concentration of 6.7×1014 K atoms/cm2. The work function of Pd decreased to a minimum at a coverage of 2.7×1014 K atoms/cm2 and then increased toward the value of metallic potassium. The metallization began at∼1.5 monolayer. The activation energy of desorption decreased from 240 kJ/mol at zero coverage to 108 kJ/mol for monolayer coverage. Adsorption of K on Pd(100) produced four loss features (at 19.4, 18.4, 3.5 and 2.6 eV) in the EEL spectrum which were attributed to K(3p)→K(4s), K(3p)→Pd Fermi level, Pd d-band→K(4s) electron transitions and to a s-derived plasmon loss in metallic potassium.

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