Molecular ordering and adsorbate induced faceting in the Ag{110}-(S)-glutamic acid system.
The adsorption of the amino acid, (S)-glutamic acid, was investigated on Ag{110} as a function of coverage and adsorption temperature using the techniques of scanning tunneling microscopy, low energy electron diffraction, and reflection absorption infrared spectroscopy. In the monolayer, (S)-glutamic acid was found to adsorb predominantly in the anionic glutamate form. Several discrete ordered adlayer structures were observed depending on preparation conditions. In addition, (S)-glutamic acid was found to induce both one- and two-dimensional faceting of the Ag{110} surface. In some cases, evidence was found that the 2-D faceting involved the creation of a chiral facet distribution. A comparison is made of the Ag/(S)-glutamic acid system with analogous studies of amino acids on Cu.
Jones
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TE
EaStCHEM School of Chemistry, University of St Andrews, St Andrews, Fife, United Kingdom KY16 9ST.
Baddeley
C J
CJ
Gerbi
A
A
Savio
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L
Rocca
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M
Vattuone
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L