Fig. 3: Phonon dispersion curves for selected symmetries.
From: Unusual hydrogen implanted gold with lattice contraction at increased hydrogen content
a Cmmm and b P1. The brighter (yellowish) colors show the larger negative mode Grüneisen parameters, whereas the darker ones (reddish) correspond to the larger positive values. The Brillouin zone (blue) path (red lines) with reciprocal lattice points and the real lattice (dash brown lines) with positions of Au and hydrogen are also given. For easier comparison with the observed Raman data the phonons are given in the unit of cm−1 instead of the conventional unit of THz.
