Collision-induced desorption in 193-nm photoinduced reactions in (O-2+CO) adlayers on Pt(112) - art. no. 094702

摘要

The spatial distribution of desorbing O-2 and CO2 was examined in 193-nm photoinduced reactions in O-2+CO adlayers on stepped Pt (112)=[(s)3(111)x(001)]. The O-2 desorption collimated in inclined ways in the plane along the surface trough, confirming the hot-atom collision mechanism. In the presence of CO(a), the product CO2 desorption also collimated in an inclined way, whereas the inclined O-2 desorption was suppressed. The inclined O-2 and CO2 desorption is explained by a common collision-induced desorption model. At high O-2 coverage, the CO2 desorption collimated closely along the (111) terrace normal. (C) 2005 American Institute of Physics.