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 1.3eV. At submonolayer coverage it dissociates even at 90K. Thermal dissociation of adsorbed monolayer occurs at 170–250K very likely through the transient formation of C2H5Zn. The final products of the thermal dissociation, Zn and C2H5 are characterized by Zn(2p3/2) binding energy at 1021.3eV for atomically adsorbed Zn and by vibration losses at 510, 860, 1140, 1430 and 2900cm−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 400K, and desorb with Tp=860–915K. Illumination of the molecularly adsorbed layer at 90–95K enhances the extent of the dissociation to ethyl zinc. The possible pathways of the formation of different products are described.
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