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. Author manuscript; available in PMC: 2013 Aug 1.
Published in final edited form as: J Am Chem Soc. 2012 Jul 17;134(30):12658–12667. doi: 10.1021/ja3039486

Figure 3.

Figure 3

Model slice through the diagonal of a 2D IR spectrum of an isotopically labeled parallel β-sheet. The unlabeled amide I mode absorbs at 1620 cm−1, while the strongly coupled, in-register isotope labeled amino acid absorbs at ~1575 cm−1.