Structure of a β-sheet model system in the gas phase:: Analysis of the C=O stretching vibrations

In this communication the first IR/R2PI (infrared/resonant two-photon ionisation) spectra of C=O stretching vibrations are presented applied to a beta-sheet model system. C=O vibrations are extremely important to describe the structure of isolated peptides and especially the hydrogen bonding in beta-sheet related structures in the gas phase.