Influence of the metal–adsorbate interaction on secondary ion emission from UHV-prepared amino acid overlayers on metals

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Abstract
Amino acid overlayers with controlled coverages were produced in situ using a molecular beam technique. The metal–adsorbate interaction was examined by monitoring the secondary ion emission and the desorption of neutral species during temperature-programmed target heating. Identification of the desorbing neutrals was possible by comparing the thermal desorption mass spectrum with the electron impact fragmentation pattern in the molecular beam measured in a cross-beam arrangement. Considering Au and Ni substrates, different binding sites could be distinguished, which are correlated with the emission of specific molecular secondary ions. The interaction between glycine and coadsorbed D2 was examined. Only on Pt significant hydrogen exchange rates were observed.
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