Peer-Reviewed Journal Details
Mandatory Fields
Pemble, M. E.,Turner, A. R.,Shukla, N.,Bitzer, T.,Frederick, B. G.,Kitching, K. J.,Richardson, N. V.
1995
October
Journal of The Chemical Society-Faraday Transactions
Adsorption of O, Hco2h and C6h5co2h on Cu(110) Studied Using Reflectance Anisotropy - Chemical and Structural Influences on an Optically-Active Surface Resonance
Validated
()
Optional Fields
91
2020
3627
36313627
Real-time reflectance anisotropy (RA) transients have been recorded from a Cu(110) surface during exposure to O-2, O-2-HCO2H and C6H5CO2H, using a simple HeNe laser-based system operating at 1.96 eV polarised parallel to first the [1 ($) over bar 10] and then the [100] directions on the crystal surface. The marked changes in the RA response observed during the formation of the reconstructed overlayers is attributed to the quenching of an allowed optical transition of the surface, as identified using electron spectroscopy, by the process of adsorption and restructuring. However, the influence of new adsorbate-induced states on the RA response cannot be ruled out at present. The magnitude of the observed changes in RA are comparable for the formation of the p(2 x 1)O and (3 x 1)O/HCO2H structures and are tentatively assigned to a combination of the rapid quenching of an allowed surface transition and the possible modification of new adsorbate-induced states. For the formation of the c(8 x 2) benzoate overlayer the RA change is considerably larger, which is believed to be due to a more thorough quenching of the allowed surface transition than that which occurs for the other systems studied. For the formation of the initial stages of the (2 x 1)O overlayer, in particular, the RA response would be consistent with simple Langmuir adsorption kinetics providing that a model in which the RA response was directly proportional to coverage was applicable.Real-time reflectance anisotropy (RA) transients have been recorded from a Cu(110) surface during exposure to O-2, O-2-HCO2H and C6H5CO2H, using a simple HeNe laser-based system operating at 1.96 eV polarised parallel to first the [1 ($) over bar 10] and then the [100] directions on the crystal surface. The marked changes in the RA response observed during the formation of the reconstructed overlayers is attributed to the quenching of an allowed optical transition of the surface, as identified using electron spectroscopy, by the process of adsorption and restructuring. However, the influence of new adsorbate-induced states on the RA response cannot be ruled out at present. The magnitude of the observed changes in RA are comparable for the formation of the p(2 x 1)O and (3 x 1)O/HCO2H structures and are tentatively assigned to a combination of the rapid quenching of an allowed surface transition and the possible modification of new adsorbate-induced states. For the formation of the c(8 x 2) benzoate overlayer the RA change is considerably larger, which is believed to be due to a more thorough quenching of the allowed surface transition than that which occurs for the other systems studied. For the formation of the initial stages of the (2 x 1)O overlayer, in particular, the RA response would be consistent with simple Langmuir adsorption kinetics providing that a model in which the RA response was directly proportional to coverage was applicable.
0956-50000956-5000
://WOS:A1995TC05100010://WOS:A1995TC05100010
Grant Details