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Artículo
Low-frequency excitations in a molecular glass: Single-particle dynamics
(American Institute of Physics Publising LLC, 1992)
The low-frequency dynamics of a molecular glass former has been investigated by means of inelastic neutron scattering from a mostly incoherent sample as well as by computer molecular-dynamics simulation. The mode assignments ...
Artículo
Low-frequency excitations in glassy selenium: A comparison of neutron-scattering and molecular-dynamics results
(American Institute of Physics Publising LLC, 1993)
The microscopic low-frequency dynamics of glassy selenium is investigated by means of the concurrent use of neutron inelastic scattering and computer simulations. A separation of the dynamic response in terms of intra- and ...
Artículo
Thermal transport in glassy selenium: The role of low-frequency librations
(American Institute of Physics Publising LLC, 1994)
The experimental curves giving the temperature dependence of the thermal conductivity of glassy selenium are considered in detail. The observed behavior can be taken into account quantitatively if the densities of states ...
Artículo
Purely dynamical signature of the orientational glass transition
(American Physical Society, 1999-10-04)
The dynamics of the freezing transition of the rotator phase crystal of ethanol into its orientational glass phase is monitored by measurements of molecular rotational components in the quasielastic neutron scattering ...
Artículo
Optical phonons, crystal-field transitions, and europium luminescence-excitation processes in Eu2BaCoO5: Experiment and theory
(American Institute of Physics Publising LLC, 1994)
The Europium compound Eu2BaCoO5 has been studied by means of Raman and x-ray-absorption spectroscopies. The eigenfunctions and frequencies of the optical normal modes have been calculated from an adequate potential showing ...
Artículo
Microscopic dynamics of glycerol in its crystalline and glassy states
(American Physical Society, 1996)
The dynamics of crystalline glycerol are studied by means of Raman spectroscopy and lattice dynamics calculations employing a semiflexible model to represent the low-lying molecular vibrations. The latter is validated ...
Artículo
Incommensurate instability and lattice dynamics of potassium selenate within a semiempirical rigid-ion model
(American Institute of Physics Publising LLC, 1990)
The lattice dynamics of potassium selenate is analyzed using a rigid-ion model with the selenate groups reduced to rigid bodies. The interatomic forces have been adjusted only using static structural data. The number of ...
Artículo
Collective excitations in liquid methanol: A comparison of molecular, lattice-dynamics, and neutron-scattering results
(American Institute of Physics, 1992)
The collective dynamics of liquid methanol‐d4 is studied by means of molecular‐dynamics simulation. The model potential is validated by means of lattice energy calculations and shows a very good agreement with the ...
Artículo
Evidence for a supercooled plastic-crystal phase in solid ethanol
(American Physical Society, 1996)
The existence of an orientationally disordered cubic phase of solid ethanol is revealed by x-ray diffraction and Raman spectroscopic measurements. Such a phase, whose existence was postulated some time ago on the basis of ...
Artículo
Correlated atomic motions in glassy selenium
(American Institute of Physics Publising LLC, 1994)
The elastic and total (energy-integrated) structure factors for glassy selenium have been measured by means of neutron spectroscopy within the temperature range 15 KT310 K. The correlated nature of the atomic vibrations ...