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The adsorption and reaction of glycine on the surface of a rutile TiO 2 (011) single crystal has been studied by X-ray Photoelectron Spectroscopy (XPS) and Temperature Programmed Desorption (TPD) techniques. Special attention was given to the formation and stability of the zwitterion structure ( + NH 3 –CH 2 –COO − ) in comparison to that of the dissociated...