The adsorption of and reaction of NO_2 on Ag(111)-p(4 x 4)-O and formation of surface nitrate

摘要

The adsorption and reaction of nitrogen dioxide on the Ag(111)-p(4 x 4)-O surface has been investigated with RAIRS, TPRS and STM. At 300 K NO_2 initially reacts with the oxygen overlayer to form nitrate in p(3 x 3) and p(4 x 4) structures, which convert to a new p(3 x 3) at saturation coverage. Surface pitting during nitrate adsorption is suggestive of the incorporation of silver atoms into the NO_3 structure. With heating NO_3 decomposes into NO_2 and O at 396 K and 497 K, and oxygen desorbs at 578 K.