The chemisorption and photodecomposition of trimethylindium (TMIn) and trimethylgallium (TMGa) on GaAs(lO0) surfaces have been studied by angleresolved X-ray photoelectron spectroscopy. The In-C bond cleavage of the adsorbed TMIn was observed when the substrate temperature was raised from 150 K to 300 K. The dissociation generates methyl radicals that react with the substrate Ga species to form the Ga-C bond. The In-C bond Is also dissociated by 193 nm laser irradiation of TMIn adsorbed on the GaAs at 150 K. Irradiation at 351 nm caused no change in the X-ray photoelectron spectra since photodissociation is not due to the photoabsorption of the GaAs substrate but the photodecomposition of the adsorbed species. Similar results are observed for TMGa on a GaAs(lO0) substrate.
Pyrolytic dissociation of trimethylgallium (TMGa) on Si, Au, and Al substrates was studied at various temperatures from 80 to 670 K by x-ray photoelectron spectroscopy of Ga (3d) and C (1s). The intensity and band profile of carbon and gallium signals from TMGa adsorbed on the substrates were measured. The results indicate that TMGa on Si (111) dissociates into Ga and CH3 on the substrate even at 200 K and CH3 further dissociates into C, CH, and CH2 at higher temperatures. Most carbon and gallium species remain on the Si substrate. Carbon species leave the Au and Al substrate but Ga remains on the surface. The pyrolysis of TMGa on GaAs (100), Si (111), and Si (100) substrates is compared and the mechanism of carbon incorporation in photolysis and pyrolysis is discussed. Photodissociation of a monolayer of TMGa on Si and Au is observed with an incident wavelength of 266 nm; direct absorption by the adsorbed molecules occurs at this wavelength. At 355 nm, photodissociation does not occur.
An angle-resolved X-ray photoelectron spectroscopic study has been performed on structures of self-assembling systems, viz ferrocenylthiols on a gold (111) crystal. The angular dependence of the intensities of photoemission reveals that ferrocenyl groups are on the outermost layer, separated from the gold substrate by hydrocarbon chains of the thiol groups
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