We report, for the first time, extended very far IR (VFIR) intensity data (2.5-30 cm-1) for solutions of NaCl, LiCl, and HCl in water over the accessible concentration (0-10 M) and temperature ranges (-100° to 80 °C). This allows dynamic processes in the 0.2-2.0 ps regime to be probed, a suitable choice in view of much experimental data which shows that dynamic processes in this regime are impo...

Single-crystal x-ray diffraction from clathrate-II Na(x)Si(136) (x = 24) prepared by a new technique reveals the exceptionally large Na@Si(28) atomic displacement parameter (U(eq)) is strongly temperature dependent, and can be attributed to low-energy rattling modes associated with the Na guest. Inelastic neutron scattering (INS) spectra collected from Na(x)Si(136) powder specimens (x = 3, 23) ...

a woman, supposed to be under the influence of some poison which had been taken between nine and ten p.m and ha<ff produced a state of unconsciousness within "about text minutes," according to the statement of her friends. When H arrived, she was lying pale and unconscious. The skin was; cool and clammy. The pulse was 136, small and soft. Thesr breathing was heavy and rattling; and a pinkish fr...

We investigate the role of rattling guest atoms on the lattice thermal conductivity of a type-I clathrate Ba_{8}Ga_{16}Ge_{30} by first-principles lattice dynamics. Comparing phonon properties of filled and empty clathrates, we show that rattlers cause tenfold reductions in the relaxation time of phonons by increasing the phonon-phonon scattering probability. Contrary to the resonant scattering...

Density fluctuations in supercooled liquids near the glass transition relax in multiple steps. The short time relaxation is known as β-relaxation and the final long time relaxation is called α-relaxation. It is believed that the long time α-relaxation is a cooperative phenomena associated with a growing length scales, whereas the short-time β-relaxation is often attributed to spatially local pr...

Vertebrate sound producing muscles often operate at frequencies exceeding 100 Hz, making them the fastest vertebrate muscles. Like other vertebrate muscle, these sonic muscles are "synchronous," necessitating that calcium be released and resequestered by the sarcoplasmic reticulum during each contraction cycle. Thus to operate at such high frequencies, vertebrate sonic muscles require extreme a...

We have calculated the room temperature thermal conductivity in semiconductor germanium clathrates using statistical linear-response theory and an equilibrium molecular dynamics (MD) approach. A key step in our study is to compute a realistic heat-current J (t) and a corresponding auto-correlation function < J (t) J (0) >. To ensure convergence of our results and to minimize statistical fluctua...

The coherent Sc Q , and single-particle Ss Q , dynamic structure factors which contribute to the lowenergy spectrum of molten potassium are separated by means of neutron polarization analysis. The linewidth and amplitude of the single-particle spectra follow an apparent sub-Fickian behavior, with a diffusion coefficient below the value found by macroscopic means. Once this is accounted for, the...