High-frequency subsurface and bulk dynamics of liquid indium.
We have performed bulk and surface-sensitive inelastic x-ray scattering experiments on liquid indium with 3 meV energy resolution. The experimental data are well reproduced within a generalized hydrodynamic model including structural and microscopic relaxation processes. We find a longitudinal viscosity of 22 mPa s in the near-surface region compared to 7.4 mPa s in the bulk. The origin of the increase is associated with a slowing down of the collective dynamics in a subsurface region of 4.6 nm.
Reichert
H
H
Max Planck Institut für Metallforschung, Heisenbergstrasse 3, D-70569 Stuttgart, Germany.
Bencivenga
F
F
Wehinger
B
B
Krisch
M
M
Sette
F
F
Dosch
H
H