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Spectrospic characterization of cationic amides: ZEKE photoelectron spectriscopy has been successfully applied to isomers of the model peptide formanilide. The spectra indicate that significant charge delocalization occurs from the aromatic ring to the side chain in the ion. The picture shows the spectrum of the trans isomer together with the side-chain in-plane bending and amide stretching modes that are associated with B′ and Σ′ bands. IE = ionization energy.
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Ullrich et al. (2002) studied this question.
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