Phys. Rev. Lett. 91, 203003 (2003) [4 pages]Fingerprint IR Spectroscopy to Probe Amino Acid Conformations in the Gas PhaseReceived 25 June 2003; published 12 November 2003 We report the infrared (IR) absorption spectra of different conformational isomers of gas phase amino acid molecules in the molecular fingerprint region of 330–1500 cm-1. The IR absorption spectra for three conformers of the amino acid tryptophan show absorption bands that uniquely identify the conformational structure of the molecule and that are well matched by density functional theory calculations. The present observations hold great promise for future identification of conformational folding of larger molecules by means of their IR absorption characteristics. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.91.203003
DOI:
10.1103/PhysRevLett.91.203003
PACS:
33.20.Ea, 31.15.Ew, 33.15.Bh, 33.20.Tp
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