Fig. 4: Pump slice amplitudes (PSA) calculated from 2D IR spectra capture the main features of secondary structures in three frequency regions.
From: Crowding alters F-actin secondary structure and hydration
The spectra are normalized to the maximum intensity for the comparison among three samples. The pump frequency is plotted along the horizontal axis. Shaded areas indicate three spectral features, where blue, pink, and yellow represent approximate frequency regions for β-sheet, α-helix, and loop structure, respectively.
