Fig. 2: Temperature dependence of the fit parameters for the intermolecular modes.
From: Understanding the emergence of the boson peak in molecular glasses
a Ratio of the amplitude of the low-frequency intermolecular mode over that of the high-frequency one. The solid red line is an exponential fit to guide the eye (The data point at 200 K was omitted in this fit on account of the noise at low frequencies in the corresponding OKE data). b Centre frequency ω0 of the two intermolecular modes (blue squares and red disks, also shown are linear and exponential fits to guide the eye) and the corresponding widths σ (green triangles and yellow diamonds respectively, also shown are an exponential fit and a horizontal line to guide the eye).
