Inelastic collective dynamics of liquid rubidium with increasing temperature by neutron scattering studies

2006 ◽  
Vol 74 (18) ◽  
Author(s):  
F. Demmel ◽  
D. Pasqualini ◽  
C. Morkel
Keyword(s):  
Neutron Scattering ◽  
Collective Dynamics ◽  
Increasing Temperature

Collective dynamics of liquid deuterium: Neutron scattering and approximate quantum simulation methods

2021 ◽  
Vol 104 (17) ◽  
Author(s):  
Eleonora Guarini ◽  
Fabrizio Barocchi ◽  
Alessio De Francesco ◽  
Ferdinando Formisano ◽  
Alessio Laloni ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Quantum Simulation ◽  
Simulation Methods ◽  
Collective Dynamics

Diffusive Motion of Alkali Atoms in Graphite: A Quasielastic Neutron Scattering Study

1982 ◽  
Vol 20 ◽  
Author(s):  
H. Zabel ◽  
A. Magerl ◽  
J.J. Rush ◽  
A.J. Dianoux
Keyword(s):  
Neutron Scattering ◽  
Diffusive Motion ◽  
Lorentzian Line ◽  
Alkali Atoms ◽  
Dynamical Aspect ◽  
Quasielastic Neutron ◽  
Scattering Study ◽  
Quasielastic Neutron Scattering ◽  
Neutron Scattering Study ◽  
Increasing Temperature

ABSTRACTWe have studied the diffusive motion of alkali atoms in thermodynamic equilibrium in RbC24 by quasielastic neutron scattering. The neutron spectra show Lorentzian line profiles. The widths increase with increasing temperature. In addition a ‘de Gennes’ narrowing is observed at Q=1.2 Å-1, which coincides with the first peak in the intercalant structure factor. The narrowing becomes more pronounced at higher temperatures in contrast to a normal liquid. The data can be interpreted by the motion of clusters of alkali atoms rather than by a liquid type motion. This adds a dynamical aspect to the “floating solid’ as described by Nelson and Halperin for the melting of a 2-dimensional solid.

scholarly journals Collective dynamics of liquid carbon tetrachloride studied by inelastic neutron scattering and computer simulation

1992 ◽  
Vol 96 (11) ◽  
pp. 8477-8484 ◽  
Author(s):  
M. García‐Hernández ◽  
J. L. Martínez ◽  
F. J. Bermejo ◽  
A. Chahid ◽  
E. Enciso
Keyword(s):  
Computer Simulation ◽  
Carbon Tetrachloride ◽  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Liquid Carbon ◽  
Collective Dynamics

Collective dynamics of liquid potassium studied by inelastic neutron scattering

1997 ◽  
Vol 234-236 ◽  
pp. 359-361 ◽  
Author(s):  
A.G. Novikov ◽  
V.V. Savostin ◽  
A.L. Shimkevich ◽  
M.V. Zaezjev
Keyword(s):  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Collective Dynamics

scholarly journals Collective Dynamics and Coherent Neutron Scattering in GFP

2014 ◽  
Vol 106 (2) ◽  
pp. 460a
Author(s):  
Jonathan D. Nickels ◽  
Stefania Perticaroli ◽  
Georg Ehlers ◽  
Hugh O'Neill ◽  
Alexei P. Sokolov
Keyword(s):  
Neutron Scattering ◽  
Collective Dynamics

scholarly journals Coherent Neutron Scattering and Collective Dynamics in the Protein, GFP

2013 ◽  
Vol 105 (9) ◽  
pp. 2182-2187 ◽  
Author(s):  
Jonathan D. Nickels ◽  
Stefania Perticaroli ◽  
Hugh O’Neill ◽  
Qiu Zhang ◽  
Georg Ehlers ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Collective Dynamics

Real and Virtual Kohn Effect in Palladium by Inelastic Neutron Scattering

1975 ◽  
Vol 53 (22) ◽  
pp. 2491-2501 ◽  
Author(s):  
A. P. Miiller
Keyword(s):  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Frequency Shifts ◽  
Fermi Surfaces ◽  
Phonon Line ◽  
Electron Phonon Interaction ◽  
Instrumental Resolution ◽  
Line Widths ◽  
Increasing Temperature

A detailed study has been made of the anomalous lattice vibrations in palladium by inelastic neutron scattering. Anomalous shifts in the phonon frequencies are particularly evident along the [0ζζ] T1 branch at reduced wave vectors [Formula: see text] to 0.4, becoming rapidly weaker at 'off symmetry' wave vectors. (Rather similar effects have also been observed in platinum.) The phonon wave vectors corresponding to possible Kohn transitions in the symmetry planes have been computed, using the Fermi surfaces given in the literature. The results indicate that the anomalous frequency shifts arise largely from transitions across the 'heavy' hole Fermi sheet formed from the fifth band electrons. Measurements along the T1 branch at temperatures between 8 and 853 °K show that the anomalous frequency shifts are smeared out in wave vector and perhaps weakened with increasing temperature. The corresponding phonon line widths, obtained by correction of the neutron groups for instrumental resolution, were found to be anomalously broadened as well, particularly at 8 °K where anharmonic effects are expected to be small. This suggests that the anomalous line widths reflect, in large part, the reduction in phonon lifetimes (and in electron lifetimes) arising from real Kohn transitions. This is believed to be the first identification of phonon line broadening because of electron–phonon interaction in a nonsuperconductor.

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