Collision Induced Desorption of Large Molecules From Surfaces: Trimethylamine Removal from Ru(0001)
The effect of incident kinetic energy of colliding molecules or atoms on the outcome of activated reactions on metallic surfaces is of general interest in model heterogeneous catalysis. Previous studies have focused on small molecules involved in both direct molecule-surface collisions and collision induced processes. This work presents a study of the interaction of incoming energetic colliders, Ar and Kr, with the large molecule trimethylamine (TMA). In these experiments, the TMA is adsorbed on either a clean Ru(0001) surface or an oxygen covered Ru(0001). The results show that at an incident collider energy of 1.0–2.8 eV, collision induced desorption (CIDE) is the dominant reactivity pathway over collision induced dissociation (CIDI). These observations suggest that energy redistribution within the adsorbed molecule following collision is fast and prevents channeling of the collision energy to internal bond scission.
KeywordsSurface dynamics Collision induced desorption (CIDE) Trimethylamine TPD
This work was partially supported by the Israel Science Foundation (ISF) and the German Israel Foundation (GIF). The help of Michelle Akerman is greatly appreciated.
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