Fig. 1 | Nature Communications

Fig. 1

From: Protein and RNA dynamical fingerprinting

Fig. 1

Directionality of global intramolecular vibrations. The vector diagrams of two calculated low frequency vibrations for CEWL at (a) 12.3 cm−1 (0.37 THz) and b 11.6 cm−1 (0.35 THz). The orange shaded region highlights the binding region. While the two vibrations nearly overlap in energy, their motions are dramatically different. For the 12.3 cm−1 case the largest amplitude motion is largely out of the page, with little motion around the binding site, whereas the 11.3 cm−1 vibration moves in the page with a large compressive motion into the binding region. The black arrows indicate the light polarization direction needed to excite the vibration, demonstrating that polarization dependent absorption measurements on aligned samples readily discriminates between the two vibrations

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