Abstract
X-ray scattering experiments with energy resolutions in the range of several meVs open new possibilities for the study of the dynamics in condensed matter under high pressures. A special beryllium pressure cell was used in our investigations of liquid and solidified single crystalline helium at 58 MPa. The dynamical excitations could be clearly identified. Another type of pressure cell, the Paris-Edinburgh cell, allowed the observation of longitudinal phonons of silicon under a pressure of 4 GPa.
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