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Figure 6
Two representative spectra. The measurements were performed by statically collecting without any mechanical scans. ζ denotes the momentum transfer values in units of 2π/a, where a is the lattice parameter along the (0 0 l) direction. The peak in the middle (zero energy loss) is the elastic peak, and the peaks on the right and left are the phonon creation and annihilation peaks, respectively. Excitations at energies as low as 16 meV can be resolved (inset). Each spectrum was recorded in 300 s.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 22| Part 4| July 2015| Pages 961-967
https://doi.org/10.1107/S1600577515009686
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