Coherent inelastic neutron scattering

Figure 4 Schematic vector diagrams illustrating the use of coherent inelastic neutron scattering to determine phonon dispersion relationships, (a) Scattering m real space (h) a scattering triangle illustrating the momentum transfer, Q, of the neutrons in relation to the reciprocal lattice vector of the sample t and the phonon wave vector, q. Heavy dots represent Bragg reflections.

Dorner, B., Coherent inelastic neutron scattering in lattice dynamics, in Tracks in Modern Physics, Vol. 93. Springer, Berlin, 1982. 

Leake, J. A.. W. B. Daniels, J. J. Skalyo, B. C. Frazer, and G. Shirane 1969, Lattice dynamics of neon at two densities from coherent inelastic neutron scattering . Phys. Rev. 181 1251-1260. 

B. Domer (1982). Coherent Inelastic Neutron Scattering in Lattice Dynamics, Springer Tracts In Modem Physics, vol. 93, Springer-Verlag, Berlin. 

P. A, Reynolds,/ Chem. Phys., 59, 2777 (1973). Lattice Dynamics of the Pyrazine Crystal Studied by Coherent Inelastic Neutron Scattering. 

Fig. 5.8 shows the experimental phonon dispersion relations of a perdeuterated naphthalene crystal (N-dg) determined at a temperature T = 6 K by inelastic neutron scattering [7]. Deuterium (D) has a much higher scattering cross section for coherent inelastic neutron scattering than the isotope H. Nevertheless, to gain a... 

K being a vector of the reciprocal lattice. Coherent inelastic neutron scattering remains a powerful method for... 

Table 4.1-59 Phonon wavenumbers of gallium compounds. Gallium nitride (GaN), T = 300K, from Raman spectroscopy gallium phosphide (GaP), RT, from an analysis of Raman, neutron, luminescence, and absorption data gallium arsenide (GaAs), T = 296 K, from coherent inelastic neutron scattering gallium antimonide (GaSb), T = 300 K, from second-order Raman effect...

Table 4.1-80 Phonon wavenumbers of indium compouuds. Indium nitride (InN), T = 300 K indium phosphide (InP), RT, from coherent inelastic neutron scattering, carrier concentration n = 10 em indium arsenide (InAs), from Raman scattering indium antimonide (InSb), T = 300 K, from inelastic neutron scattering, carrier concentration n = SxlO cm ...

One of the challenging works is to evaluate the spatial scale of boson peak mode. By analyzing the Q dependence of coherent inelastic neutron scattering from vitreous silica, Buchenau et al. [26] assigned the boson peak mode to a coupled rotation of five tetrahedra of Si04, which correspond to a spatial scale of... 

Tablei. .1-9 Phonon frequencies at symmetry points. Diamond (C) (v in THz, 300 K, from Raman spectroscopy) silicon (Si) (v in THz, 296 K, from inelastic neutron scattering) germanium (Ge) (v in THz, 300 K, from coherent inelastic neutron scattering) gray tin (cr-Sn) (v in THz, 90 K, from inelastic thermal neutron scattering) silicon carbide (3C-SiC) (phonon wavenumbers v in cm RT, from Raman spectroscopy) silicon carbide (6H-SiC) (v in THz, derived from photoluminescence data)...

Patterson and Lynn [6] have reported a lattice dynamical study of the host lattice CsjSiFg based on neutron scattering, Raman, and infrared absorption measurements. Dispersion relations for phonons with energies less than 160 cm have been determined along three symmetry directions by coherent inelastic neutron scattering experiments. In Fig. 7 the photon dispersion results for Cs2SiFg are shown [6] in which the experimental data are represented by circles. The solid lines correspond to dispersion curves calculated with a rigid-ion, lattice dynamical model. 

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