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Zusammenfassung:
The adsorption of NO2/ads on a clean Au(111) surface has been studied using electron spin resonance (ESR) and thermal programmed desorption (TPD). NO2/Au(111) appears to be an appropriate system in which to detect an ESR signal, because it is known from the literature that NO2 adsorbs as a molecule and is bonded through its oxygen atoms to the surface, while the spin is more localized at the nitrogen atom. In agreement with former results, no resonance of a paramagnetic monolayer on a clean single-crystal metal surface is observed. However, a well resolved spectrum from a multilayer has been detected. Orientation of the molecules in the multilayer has been studied via angle-dependent measurements in combination with computer simulation. Temperature-dependent measurements are used to investigate reactivity and molecular motion.
