Slowing Down of Molecular Reorientations in [Ni(NH3)6](N03)2

1994 ◽  
Vol 376 ◽  
Author(s):  
Jerzy A. Janik ◽  
Jacek Mayer ◽  
Jan Krawczyk ◽  
Tormod Riste ◽  
Kaare Otnes ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Diffusion Model ◽  
Phase Ii ◽  
Rotational Diffusion ◽  
Phase Iii ◽  
Slowing Down ◽  
Jump Model ◽  
Scattering Measurements ◽  
Quasielastic Neutron ◽  
Quasielastic Neutron Scattering

ABSTRACTQuasielastic neutron scattering measurements of [Ni(NH3)6](N03)2 were made with two different resolutions of ca. 140 and 30 μeV. The following suggestions are analyzed:1. The NH3 rotational diffusion model is more adequate than NH3 120° jump model.2. Some NH3 groups slow down whereas some rotate rapidly.3. There exists an additional QNS component close to the phase II/phase III transition.

NH3 reorientation in phases I, II, and III of Ni(NH3)6(NO3)2

1988 ◽  
Vol 66 (4) ◽  
pp. 692-697 ◽  
Author(s):  
Gordon J. Kearley ◽  
Herma Blank
Keyword(s):  
Phase Transition ◽  
Neutron Scattering ◽  
Strong Interaction ◽  
Rotational Motion ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Phase Iii ◽  
Single Type ◽  
Quasielastic Neutron ◽  
Quasielastic Neutron Scattering

The inelastic neutron scattering (INS) spectra of rotational tunnelling and librations of NH3 ligands in phase III of Ni(NH3)6(NO3)2 are not consistent with a rotational hindrance potential containing only cos [Formula: see text] terms owing to strong interaction between neighboring cations. This type of interaction, and motion of the whole cation, also influences the classical reorientational motions involving displacement of the H atoms, where the overall radius of rotation is consistently greater than the 0.9 Å expected for isolated NH3 rotors. Quasielastic neutron scattering (QNS) suggests that in phase III there are two sublattices of cations, one of which becomes completely disordered (with respect to the NH3 rotors) at the III–II phase transition. Disorder of the second sublattice marks the II–I transformation where only a single type of rotational motion is found.

Quasielastic neutron scattering measurements of fast process and methyl group dynamics in glassy poly(vinyl acetate)

2006 ◽  
Vol 328 (1-3) ◽  
pp. 53-63 ◽  
Author(s):  
Chuhong Zhang ◽  
Valeria Arrighi ◽  
Simona Gagliardi ◽  
Iain J. McEwen ◽  
Jeerachada Tanchawanich ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Vinyl Acetate ◽  
Group Dynamics ◽  
Fast Process ◽  
Methyl Group ◽  
Scattering Measurements ◽  
Quasielastic Neutron ◽  
Quasielastic Neutron Scattering ◽  
Methyl Group Dynamics
Sign in / Sign up

Export Citation Format

Share Document