Surface photochemistry

Adsorption and dissociation of CH3Cl on clean and K-promoted Pd(100) surfaces

F. Solymosi, J. Kiss, Károly Révész

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

The photochemistry of adsorbed CH3Cl on clean and potassium-dosed Pd(100) surfaces has been studied by illumination with low-intensity UV light from a high-pressure Hg lamp. The effects of illumination were established by post-irradiation thermal desorption, Auger and photoelectron spectroscopic measurements. Evidences are presented for photodissociation of the C-Cl bond to give surface bound methyl group coadsorbed with chlorine. The thermal decomposition of the surface methyl is accompanied by desorption of methane, and small amounts of ethane and ethylene. The presence of preadsorbed potassium greatly enhanced the extent of photodissociation of the C-Cl bond. The efficiency of potassium adatoms depended on its amount, i.e., on the work function of the coadsorbed systems. From the study of the wavelength dependence it is concluded that in the photodissociation of CH 3-Cl the optical excitation of the substrate to produce photoelectrons plays a dominant role.

Original languageEnglish
Pages (from-to)8510-8519
Number of pages10
JournalThe Journal of Chemical Physics
Volume94
Issue number12
Publication statusPublished - 1991

Fingerprint

Photodissociation
Photochemical reactions
photochemical reactions
photodissociation
potassium
Potassium
dissociation
Photoelectrons
Adsorption
adsorption
photoelectrons
Lighting
desorption
illumination
Thermal desorption
Ethane
Adatoms
Photoexcitation
Chlorine
Methane

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Surface photochemistry : Adsorption and dissociation of CH3Cl on clean and K-promoted Pd(100) surfaces. / Solymosi, F.; Kiss, J.; Révész, Károly.

In: The Journal of Chemical Physics, Vol. 94, No. 12, 1991, p. 8510-8519.

Research output: Contribution to journalArticle

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AB - The photochemistry of adsorbed CH3Cl on clean and potassium-dosed Pd(100) surfaces has been studied by illumination with low-intensity UV light from a high-pressure Hg lamp. The effects of illumination were established by post-irradiation thermal desorption, Auger and photoelectron spectroscopic measurements. Evidences are presented for photodissociation of the C-Cl bond to give surface bound methyl group coadsorbed with chlorine. The thermal decomposition of the surface methyl is accompanied by desorption of methane, and small amounts of ethane and ethylene. The presence of preadsorbed potassium greatly enhanced the extent of photodissociation of the C-Cl bond. The efficiency of potassium adatoms depended on its amount, i.e., on the work function of the coadsorbed systems. From the study of the wavelength dependence it is concluded that in the photodissociation of CH 3-Cl the optical excitation of the substrate to produce photoelectrons plays a dominant role.

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