Experimental aspects of inelastic X-ray scattering studies on liquids under extreme conditions (P-T)

Abstract

In this study, collective excitations of liquid indium are studied just above the melting point at different pressures (1.7 GPa, 240 • C; 3.0 GPa, 300 • C; 4.0 GPa, 360 • C). The pressures and temperatures are achieved by the use of an externally heated diamond anvil cell. Clear evidence for the existence of propagating modes is observed from the dynamical structure factor at constant momentum transfer (Q) up to about 18 nm −1 . The reason for the observed high elastic-scattering background is identified, and its effects on the determination of elastic properties such as viscosity are discussed.

New developments in high pressure x-ray spectroscopy beamline at High Pressure Collaborative Access Team

“…A slit or double slit system is used traditionally. 30 At HPCAT, we are currently using a tweezers slit as shown in Figure 5(a). To achieve background scattering rejection, the slit needs to be put as close as possible to the sample and a paranomic DAC with large open angle is often used due to ease of access.…”