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Two-dimensional IR vibrational echo spectra of the CO antisymmetric stretching mode of W(CO)6 in DLPC vesicle bilayers 72 nm in diameter at short Tw = 0.5 ps (Upper) and long Tw = 42 ps (Lower). The change in 2D line shape with time reveals the time dependence of spectral diffusion which is caused by the structural dynamics of the bilayer.
