Deep inelastic neutron scattering from fluid hydrogen and deuterium: From vibrational excitations to the impulse approximation

1999 ◽  
Vol 60 (14) ◽  
pp. 10008-10021 ◽  
Author(s):  
C. Andreani ◽  
D. Colognesi ◽  
E. Pace
Keyword(s):  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Impulse Approximation ◽  
Inelastic Neutron ◽  
Vibrational Excitations

Impulse approximation neutron scattering from N2

1995 ◽  
Vol 73 (11-12) ◽  
pp. 772-778 ◽  
Author(s):  
R. A. Cowley ◽  
M. P. Zinkin ◽  
R. S. Eccleston ◽  
A. C. Evans ◽  
M. J. Harris
Keyword(s):  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Impulse Approximation ◽  
Inelastic Neutron ◽  
Vibrational Modes ◽  
Excitation Energies ◽  
Energy Transfers ◽  
Molecular Excitation ◽  
The Individual ◽  
Good Agreement

We present the results of a detailed investigation of the inelastic neutron scattering from diatomic N2, at wave-vector transfers in the range Q = 20–100 Å−1 (1Å = 10−10 m). At intermediate Q, the scattering shows structure arising from the vibrational modes of the molecule, while at large Q the scattering is well described by the impulse approximation for the individual atoms, despite the fact that the corresponding energy transfers are considerably less than the maximum molecular excitation energies. We find good agreement for all Q with a calculation incorporating the internal rotational and vibrational modes of the molecule explicitly.

Proton Vibrations in Lithium Imide and Amide Studied through Incoherent Inelastic Neutron Scattering

2010 ◽  
Vol 72 ◽  
pp. 158-163 ◽  
Author(s):  
Daniele Colognesi ◽  
Antonino Pietropaolo ◽  
Aníbal Javier Ramírez-Cuesta ◽  
Michele Catti ◽  
Angelo Claudio Nale ◽  
...  
Keyword(s):  
Low Temperature ◽  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Data Sets ◽  
Ab Initio Simulations ◽  
Low Temperature Crystal Structure ◽  
Lithium Imide ◽  
Vibrational Excitations ◽  
Experimental Findings

Lithium imide (Li2NH) and amide (LiNH2) belong to the Li-H-N system, which has been recently considered for on-board hydrogen storage applications. However the imide low-temperature crystal structure is still highly controversial, with at least six options compatible with the diffraction experimental findings. A complementary study on low-temperature Li2NH and LiNH2 has been recently accomplished by the authors using neutron spectroscopy (with energy transfer in the 3-500 meV range). The rationale of these measurements was that crystal structures (especially their proton arrangements) affect in a strong way the neutron scattering spectra, so that a combined use of computer ab-initio simulations and inelastic neutron scattering could be a stringent validation method for the various models. Data analysis has pointed out broad and almost featureless proton-projected phonon densities of states for lithium imide, with large differences in the data sets derived from forward scattering and backscattering detector banks. On the contrary, a sharp phonon spectrum and much less discrepancy was found applying the same analytic procedure to lithium amide. This Li2NH peculiarity has been interpreted as an effect of the fast proton jump diffusion among the available lattice sites, which smears out the phonon vibrational excitations in a momentum transfer-dependent way.

Inelastic neutron scattering studies of vibrational excitations of hydrogen in Nb and Ta

1983 ◽  
Vol 27 (4) ◽  
pp. 1980-1990 ◽  
Author(s):  
J. Eckert ◽  
J. A. Goldstone ◽  
D. Tonks ◽  
D. Richter
Keyword(s):  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Vibrational Excitations

Anomalous vibrational modes in acetanilide as studied by inelastic neutron scattering

1992 ◽  
Vol 2 (10) ◽  
pp. 1929-1939 ◽  
Author(s):  
Mariette Barthes ◽  
Juegen Eckert ◽  
Susanna W. Johnson ◽  
Jacques Moret ◽  
Basil I. Swanson ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Vibrational Modes

Inelastic neutron scattering study of icosahedral AlFeCu quasicrystal

1992 ◽  
Vol 2 (2) ◽  
pp. 125-130 ◽  
Author(s):  
M. Quilichini ◽  
B. Hennion ◽  
G. Heger ◽  
S. Lefebvre ◽  
A. Quivy
Keyword(s):  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Scattering Study ◽  
Neutron Scattering Study
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