Dual-frequency 2D-IR spectroscopy heterodyned photon echo of the peptide bond
作者： I. V. Rubtsov , J. Wang , R. M. Hochstrasser
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摘要: The structure fluctuations of the peptide bond interacting with solvent are examined through coupling and correlations frequency distributions amide I II transitions. two modes anticorrelated as a result solvent-induced changes in mixing dominant valence-bond structures peptide. Significant anharmonic is seen. results application new approach to two-dimensional infrared (2D-IR) spectroscopy which pulse sequences used produce vibrational echoes incorporate frequencies. This dual-frequency arrangement greatly extends capabilities 2D-IR by allowing between widely separated be characterized analogy heteronuclear NMR. experiment exposes cross peaks, representing mode coupling, free interference strong diagonal peaks that typically dominate spectroscopy. alignment dephasing coupled transitions, this example transition dipoles, also determined these experiments.
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