Fig. 4: Collective effects in Raman spectra.
From: Uncovering low-frequency vibrations in surface-enhanced Raman of organic molecules
Simulated Raman spectra for model SAMs based on (a) three BPT (molecule 4) and (i) four MBN (molecule 5), compared to the single molecules (b, j), when located between two flat gold layers. Simulated Raman peaks (vertical solid lines) are Lorentzian broadened by 32 cm−1 for shaded curves, and dashed lines connect related vibrational modes of single molecule and model SAMs. (c–h, k–p) Vibrational motions of three dominant modes below 200 cm−1 of single-molecule (4: f–h) and (5: n–p), with corresponding modes in model SAMs for molecule (4: c–e) and (5: k–m). Atoms coloured white (H), grey (C), blue (N), brown (S), and yellow (Au), black arrows point in the direction of atomic displacements, and pale boxes denote deformations of the entire molecule.
