Potential Energy Surface in chemical reaction computations

[filippo]

What would happen to a molecule adsorbed on a flat and defect-free potential surface? Would it just stay there? Or would it go somewhere?...I see it very difficult for the reaction to occur as no preferential path is present but this is just an intuition. Does anyone have an opinion/the answer?

 

[intervoxel]

Two things can happen: it will eventually evaporate or be thrown away by brownian motion of nearby gas particles.