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The surface chemistry of proline is explored on Pd(111) using a combination of temperature-programmed desorption (TPD) and X-ray photoelectron spectroscopy. Proline adsorbs on Pd(111) at temperatures of 250K and below into second and subsequent layers prior to the saturation of the first layer, where approximately 70% of the adsorbed proline is present in its zwitterionic form. Molecular proline desorbs...
The adsorption of alanine is studied on a Pd(111) surface using X-ray photoelectron spectroscopy (XPS) and temperature-programmed desorption (TPD). It is found that alanine adsorbs into the second and subsequent layers prior to completion of the first monolayer for adsorption at ∼250K, while at ∼300K, alanine adsorbs almost exclusively into the first monolayer with almost no second-layer adsorption...
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