Abstract
Formation of AgCl on Ag surfaces exposed to Cl2 and laser stimulated desorption from chlorinated Ag surfaces have been studied. For Cl2 exposures less than 107 L, a logarithmic time dependence of the AgCl2 reaction is observed. Due to effective subsurface diffusion, the surface layer is Ag enriched with respect to stoichiometric AgCl. At higher exposures, a t12 time dependence indicates that the diffusion process becomes reaction rate limiting and a stoichiometric AgCl surface layer is formed. UV/visible laser stimulated desorption of neutral Cl, Ag and AgCl species is observed for laser power less than 150 MW cm−2. The desorption process is found to be non-thermal in nature. A desorption mechanism based on electronic excitations is discussed.
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