Surface diffusion of Ag on Pd(100) measured with specular helium scattering
We present a new method to determine surface diffusion constants using specular reflected thermal helium scattering. The specular reflected helium intensity is recorded in real time as a function of surface coverage of the adsorbate and surface temperature. The experiment is compared to a model calculation based on rate equations for the generation and destruction of adatoms and clusters. We find E/sub d1/=0.35+or-0.03 eV and nu /sub 01/=3*10/sup 9/s/sup -1/ as surface diffusion barrier and pre-exponential factor for the system Ag/Pd(100).
Keywords: adsorbed layers; atom surface impact; palladium ; silver ; surface diffusion Ag on Pd100; specular He scattering; surface diffusion; surface diffusion constants; surface coverage; adsorbate temperature; surface temperature; rate equations; adatoms ; clusters ; preexponential factor; Ag ; Pd A6822 (Surface diffusion segregation and interfacial compound formation); A6845B (Sorption equilibrium at solid fluid interfaces); A7920N (Atom molecule and ion surface impact); A68; A79; A6
Record created on 2006-07-25, modified on 2016-08-08