Abstract
The adsorption and decomposition of trimethylgallium (TMG) on Pt(111) has been studied by high-resolution electron energy loss spectroscopy (HREELS), temperature-programmed desorption (TPD), and Auger electron spectroscopy (AES). Partial decomposition (Ga-C bond cleavage) occurs during adsorption on Pt(111) at 120 K. The products are identified as CH 3 and Ga(CH 3) 2, both bound to Pt. Upon heating, multilayer TMG desorbs at 155 K and further Ga-C cleavage within the chemisorbed TMG increases the surface methyl group concentration. Carbon-hydrogen bond breaking occurs just below 300 K and supplies H atoms for the hydrogenation of methyl groups. The methane formed desorbs promptly. Hydrogen atoms also recombine to form H 2. Other than the parent, these are the only C- and H-containing species found in desorption. There is some evidence for Ga=C double bonds above 300 K. Gallium desorbs between 1000 and 1100 K, whereas residual carbon is not removed below 1200 K.
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