The adsorption of benzene on the Pt(111) surface studied by low-energy electron diffraction intensity measurements and quantitative Auger electron spectroscopy

Peter C Stair, G. A. Somorjai

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Abstract

Benzene, when chemisorbed on the Pt(111) crystal face forms an ordered metastable |04 4-2| surface structure which transforms, slowly, to a stable |04 5-2| surface structure. A complete set of intensity-voltage (I vs V) curves are presented in the appendix to aid in solving the surface structures of this complex organic molecule. The size of the unit cells and the larger than monolayer carbon surface concentrations (determined by quantitative Auger spectroscopy) indicate that most of the adsorbed benzene molecules are inclined at an angle to the surface. The similarity of the (I-V) profiles for the same diffraction beams from the two structures indicate that the carbon-platinum layer spacing changes very little during the order-order transformation.

Original languageEnglish
Pages (from-to)4361-4369
Number of pages9
JournalJournal of Chemical Physics
Volume67
Publication statusPublished - 1977

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Low energy electron diffraction
Auger electron spectroscopy
Benzene
Surface structure
Auger spectroscopy
electron spectroscopy
electron diffraction
benzene
Adsorption
adsorption
Carbon
Molecules
Platinum
energy
Monolayers
Diffraction
Spectroscopy
carbon
Crystals
Electric potential

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

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AU - Stair, Peter C

AU - Somorjai, G. A.

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N2 - Benzene, when chemisorbed on the Pt(111) crystal face forms an ordered metastable |04 4-2| surface structure which transforms, slowly, to a stable |04 5-2| surface structure. A complete set of intensity-voltage (I vs V) curves are presented in the appendix to aid in solving the surface structures of this complex organic molecule. The size of the unit cells and the larger than monolayer carbon surface concentrations (determined by quantitative Auger spectroscopy) indicate that most of the adsorbed benzene molecules are inclined at an angle to the surface. The similarity of the (I-V) profiles for the same diffraction beams from the two structures indicate that the carbon-platinum layer spacing changes very little during the order-order transformation.

AB - Benzene, when chemisorbed on the Pt(111) crystal face forms an ordered metastable |04 4-2| surface structure which transforms, slowly, to a stable |04 5-2| surface structure. A complete set of intensity-voltage (I vs V) curves are presented in the appendix to aid in solving the surface structures of this complex organic molecule. The size of the unit cells and the larger than monolayer carbon surface concentrations (determined by quantitative Auger spectroscopy) indicate that most of the adsorbed benzene molecules are inclined at an angle to the surface. The similarity of the (I-V) profiles for the same diffraction beams from the two structures indicate that the carbon-platinum layer spacing changes very little during the order-order transformation.

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