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. 2018 Feb 28;5(2):171710. doi: 10.1098/rsos.171710

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© 2018 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 1. — (a) Sketch of the scattering geometry. (b) Sample constant-q_∥ scans for the CHOL sample at q_∥=1.37 Å ⁻¹. Data were fit using a Gaussian instrumental resolution, a Lorentzian peak centred at q_∥=0 to capture incoherent scattering contributions, and three phonon excitations. The Gaussian instrumental resolution was fixed to values based on resolutions calculated using the ResLib package. The position of the incoherent peak was fixed at $ℏ ω = 0 meV$ ; all other parameters are free. The inset shows three phonon excitations (P₁, P₂ and P₃) in more detail. (c) Constant-energy scan for the ASA sample at an energy of $ℏ ω = 2.5 meV$ . All parameters are free in the constant-energy scans.