Home  About us  Contact
 

Inelastic Neutron Scattering (inelastic + neutron_scattering)

Distribution by Scientific Domains
Chemistry75%

Selected Abstracts

ChemInform Abstract: Unconventional Superconductivity in Ba0.6K0.4Fe2As2 from Inelastic Neutron Scattering.

CHEMINFORM, Issue 11 2009
A. D. Christianson
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

Phonons in the Kondo insulator YbB12

PHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 11 2004
K. S. Nemkovski
Abstract We have studied the phonon excitations in the Kondo insulator YbB12 by means of inelastic neutron scattering. The excitation spectra extended up to the energy of 130 meV that is connected with boron "molecules" vibrations mainly. The specific shape of phonon dispersion curves for low frequency lattice vibration has been found. It could be explained by weak bounding of Yb ions in the lattice. (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

[Cr8(PhCO2)16O4]·4CH3CN·2H2O: structural origin of magnetic anisotropy in a molecular spin cluster

ACTA CRYSTALLOGRAPHICA SECTION C, Issue 9 2010
John Fielden
The Cr4O4 hetero-cubane-centered octachromium(III) cluster [Cr8(PhCO2)16O4] crystallizes from fluorobenzene,acetonitrile as dodeca-,2 -benzoato-tetrabenzoatotetra-,4 -oxido-octachromium(III) acetonitrile tetrasolvate dihydrate, [Cr8(C7H5O2)16O4]·4C2H3N·2H2O, (I). Crystals produced by this method are significantly more stable than the originally published dichloromethane pentasolvate, [Cr8(PhCO2)16O4]·5CH2Cl2 [Atkinson et al. (1999). Chem. Commun. pp. 285,286], leading to a significantly higher quality structure and allowing the production of large quantities of high-quality nondeuterated and deuterated material suitable for inelastic neutron scattering (INS) measurements. Compound (I) reveals a higher symmetry structure in which the cluster sits on a twofold rotation axis, and is based on an asymmetric unit containing four crystallographically independent Cr positions, two oxide ligands, eight benzoate ligands, two acetonitrile solvent molecules and one disordered water molecule. All the Cr atoms are six-coordinate, with an octahedral geometry for the inner cubane and a more highly distorted coordination environment in the outer positions. Despite the higher symmetry, the coordination geometries observed in (I) are largely similar to the dichloromethane pentasolvate structure, indicating that crystal-packing effects have little influence on the molecular structure of [Cr8(PhCO2)16O4]. Close structural analysis reveals that the high magnetic anisotropy observed in the INS measurements is a consequence of the distorted coordination geometry of the four outer Cr atoms. [source]

Observation of Protein Domain Motions by Neutron Spectroscopy

CHEMPHYSCHEM, Issue 6 2010
Michael Monkenbusch Dr.
Abstract High-resolution inelastic neutron scattering, which is available with neutron spin-echo spectroscopy (NSE) is introduced as a tool for the analysis of biomolecule ,exibility. Coherent scattering in a range where it is sensitive to length scales of nanometers and covering a time range from picoseconds to several 100 ns makes the motion of larger subdomains within proteins visible. We show that and how the internal domain motion within a protein in solution can be measured. Comparison with displacement patterns from normal mode analysis provides further insight into the nature of the geometry of the motions that lead to the oberved dynamic signature. The NSE experiment on alcohol dehydrogenase (ADH) is used as example to illustrate the general principles of the method. [source]