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. 2004 Sep 17;87(6):4213–4225. doi: 10.1529/biophysj.104.045435

FIGURE 4.

FIGURE 4

Vertical cut through the 2D-IR spectra of the didpeptide in the phospholipid membranes at pump-pulse frequencies of 1740 cm−1 (A), 1687 cm−1 (B), and 1610 cm−1 (C) for parallel (•) and perpendicular polarizations (○) of pump and probe pulses. The corner inserts show a 10× magnified spectral response in the crosspeak spectral range. D represents the weighted difference between perpendicular and parallel polarization 2D-IR spectra. The markers indicate the crosspeaks between alanine (A), tryptophan (W), and phospholipids (P).