The inelastic neutron scattering spectrum of chloroform in solution

1986 ◽  
Vol 42 (6) ◽  
pp. 721-723 ◽  
Author(s):  
Neil Everall ◽  
Joseph Howard ◽  
Clifford J. Ludman ◽  
Brian Boland ◽  
John Tomkinson
Keyword(s):  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Scattering Spectrum

Vibrational analysis of the inelastic neutron scattering spectrum of pyridine

2000 ◽  
Vol 261 (1-2) ◽  
pp. 239-247 ◽  
Author(s):  
Francisco Partal ◽  
Manuel Fernández-Gómez ◽  
Juan J López-González ◽  
Amparo Navarro ◽  
Gordon J Kearley
Keyword(s):  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Vibrational Analysis ◽  
Inelastic Neutron ◽  
Scattering Spectrum

Inelastic neutron scattering spectrum of the fullerene C60

1991 ◽  
Vol 187 (5) ◽  
pp. 455-458 ◽  
Author(s):  
Kosmas Prassides ◽  
T. John ◽  
S. Dennis ◽  
Jonathan P. Hare ◽  
John Tomkinson ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Fullerene C60 ◽  
Scattering Spectrum

QUANTIZED INTRINSICALLY LOCALIZED MODES: LOCALIZATION THROUGH INTERACTION

2012 ◽  
Vol 11 ◽  
pp. 12-21
Author(s):  
PETER S. RISEBOROUGH
Keyword(s):  
Neutron Scattering ◽  
Experimental Observation ◽  
Phonon Spectrum ◽  
Bound States ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Localized Modes ◽  
Scattering Spectrum ◽  
Theoretical Predictions ◽  
Quartic Anharmonicity

We have calculated the lowest energy quantized spectra of Intrinsically Localized Modes (ILMs) for the Fermi-Pasta-Ulam lattices. The quantized ILM spectra are composed of resonances in the two-phonon continuum and branches of infinitely long-lived excitations that are bound states formed from even numbers of phonons. For quartic anharmonicity and one atom per unit cell, the calculated ILMs are consistent with the results of previous calculations using the number conserving approximation. However, by contrast the ILM spectrum of the lattice with cubic interactions couples resonantly with the single-phonon spectrum and cannot be calculated within a number conserving approximation. Furthermore we argue that, by introducing a sufficiently strong cubic non-linearity, the quantized ILMs can be observed directly through the single-phonon inelastic neutron scattering spectrum. We compare our theoretical predictions with the recent experimental observation of breathers in NaI by Manley et al.

Two Methods to Study Inelastic Neutron-Scattering Measurements Based on ωn(q) versus S(q, ω) Applied to the Magnetic Open Honeycomb Lattice Material Tb2Ir3Ga9

2022 ◽  
Author(s):  
R S Fishman ◽  
George Ostrouchov ◽  
Feng Ye
Keyword(s):  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Weighted Average ◽  
Inelastic Neutron ◽  
Honeycomb Lattice ◽  
Frequency Space ◽  
Advantages And Disadvantages ◽  
Scattering Spectrum ◽  
Instrumental Resolution ◽  
The Difference

Abstract This work describes two methods to fit the inelastic neutron-scattering spectrum S(q, ω) with wavector q and frequency ω. The common and well-established method extracts the experimental spin-wave branches ωn(q) from the measured spectra S(q ,ω) and then minimizes the difference between the observed and predicted frequencies. When n branches of frequencies are predicted but the measured frequencies overlap to produce only m < n branches, the weighted average of the predicted frequencies must be compared to the observed frequencies. A penalty is then exacted when the width of the predicted frequencies exceeds the width of the observed frequencies. The second method directly compares the measured and predicted intensities S(q ,ω) over a grid {q i , ωj} in wavevector and frequency space. After subtracting background noise from the observed intensities, the theoretical intensities are scaled by a simple wavevector-dependent function that reflects the instrumental resolution. The advantages and disadvantages of each approach are demonstrated by studying the open honeycomb material Tb2Ir3Ga9.

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