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Figure 5
Overall resolution function of the instrument. The data are collected by static counting on the position-sensitive detector without any energy scanning. In order to have more data points on the peak, the Bragg angle is chosen to be 88.66° (2.624 meV per pixel). The FWHM is measured to be 26 meV (with a Voigt function). A Gaussian (red solid line) and a Lorentzian (blue dashed line) with the same FWHM are shown for comparison. The y-scale is logarithmic in order to show that the quasi-elastic tails are much better than a Lorentzian.

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