Thermal and photo-induced dissociation of (C2H5)2Zn on Rh(111) surface

Gábor Klivényi, Imre Kovács, Frigyes Solymosi

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10 Citations (Scopus)

Abstract

The adsorption and dissociation of (C2H5)2Zn were studied on Rh(111) surface. The methods used included X-ray photoelectron spectroscopy (XPS), high resolution electron energy loss spectroscopy (HREELS). Auger electron spectroscopy (AES), temperature-programmed desorption (TPD) and work function measurements (Δφ). Diethyl zinc adsorbs predominantly irreversibly on an Rh surface and causes a work function decrease of 1.3 eV. At submonolayer coverage it dissociates even at 90 K. Thermal dissociation of adsorbed monolayer occurs at 170-250 K very likely through the transient formation of C2H5-Zn. The final products of the thermal dissociation, Zn and C2H5 are characterized by Zn(2p3/2) binding energy at 1021.3 eV for atomically adsorbed Zn and by vibration losses at 510, 860, 1140, 1430 and 2900 cm-1 for adsorbed C2H5. HREELS revealed the formation of adsorbed ethylene in di-σ form, which transforms into ethylidyne at higher temperature. TPD measurements showed the evolution of hydrogen, ethane and butene. The Zn adatoms formed interact strongly with the Rh above 400 K, and desorb with Tp=860-915 K. Illumination of the molecularly adsorbed layer at 90-95 K enhances the extent of the dissociation to ethyl zinc. The possible pathways of the formation of different products are described.

Original languageEnglish
Pages (from-to)115-130
Number of pages16
JournalSurface Science
Volume442
Issue number1
DOIs
Publication statusPublished - Nov 10 1999

ASJC Scopus subject areas

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

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