期刊
JOURNAL OF CHEMICAL PHYSICS
卷 118, 期 17, 页码 7733-7736出版社
AMER INST PHYSICS
DOI: 10.1063/1.1570398
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Dual frequency two-dimensional infrared (2D-IR) spectra were acquired with three IR fields, two at 3 and one at 6 mum from two pulses, creating a joint nonlinear response from both the amide-A (N-H) and the amide-I transitions of two model peptides AcAlaOMe and caprolactam. The 2D-IR spectra yield anharmonicities and correlations of inhomogeneous distributions. A positive correlation between the fundamental N-H mode frequency and its anharmonicity is found for the dipeptides. The amide-I frequencies are correlated with N-H mode frequencies and anticorrelated with the amide-I/N-H mode coupling. Structural implications of these results are discussed in relation to the anharmonic potential surface. (C) 2003 American Institute of Physics.
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