Temperature-programmed ESDIAD/TOF system as a new technique for characterization of adsorbed molecules and reaction intermediates

A temperature-programmed (TP-) electron stimulated desorption ion angular d istribution (ESDIAD) / time-of-flight (TOF) system was developed to monitor changes in adsorbed layers in real time. This system can measure ESDIAD im ages and TOF spectra of desorbing ions stimulated by pulsed electron beam i n temperature programmed surface processes. The coadsorption layers of CO a nd ammonia, the coadsorption layers of CO and methylamine, and the coadsorp tion layer of CO and acetylene on Ru(001), which were previously studied by our group using LEED, TPD and HREELS, have been observed by this system. T he change in configuration of admolecules, the change in site occupation an d the thermal evolution of adspecies can be monitored.