Spectroscopic investigation reveals low-energy electron resonances in 11-mercaptoundecanoic acid monolayers, highlighting specific molecular resonance states and nanoscale domain ordering.
We present a High-Resolution Electron Energy Loss study of an 11-mercaptoundecanoic acid self-assembled monolayer (SAM) adsorbed on Au(111). This work has to be placed in the general context of the study of thin organic layers by HREELS and of low-energy interaction mechanisms of electrons with large organic molecules. Evidence is presented here for two resonance phenomena, at ∼1.5 eV and at ∼6 eV, respectively. The first one is attributed to a negative ion resonance involving the carboxylic group, and the second one is the well-known resonance of CH 2 . From the angular distribution of the elastically scattered electrons the crystalline domain size of the monolayer is estimated to be about 100 Å.
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Magnée et al. (2003) studied this question.
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