X-ray and neutron scattering

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Structure and Dynamics of Maleic Anhydride

The Journal of Physical Chemistry A American Chemical Society (ACS) 105:13 (2001) 3064-3070

Authors:

Stewart F Parker, Chick C Wilson, John Tomkinson, David A Keen, Kenneth Shankland, Anibal J Ramirez-Cuesta, Philip CH Mitchell, Alastair J Florence, Norman Shankland
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The crystal structures of superionic Ag3SI

Journal of Physics Condensed Matter IOP Publishing 13:10 (2001) 2295

Authors:

S Hull, DA Keen, NJG Gardner, W Hayes
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Localized 4f states and dynamic Jahn-Teller effect in PrO2.

Phys Rev Lett 86:10 (2001) 2082-2085

Authors:

AT Boothroyd, CH Gardiner, SJ Lister, P Santini, BD Rainford, LD Noailles, DB Currie, RS Eccleston, RI Bewley

Abstract:

Neutron spectroscopic measurements of the magnetic excitations in PrO2 reveal (1) sharp peaks characteristic of transitions between levels of the 4f(1) configuration of Pr4+ split by the cubic crystal field, and (2) broad bands of scattering centered near 30 and 160 meV. We present a simple model based on a vibronic Hamiltonian that accounts for these contrasting features of the data. The analysis shows that 90%+/-10% of the Pr ions have a localized 4f(1) configuration and provides strong evidence for a dynamic Jahn-Teller effect in the gamma(8) electronic ground state.
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Pressure-induced phase transitions in chromium thiospinels

Physical Review B American Physical Society (APS) 63:6 (2001) 064106

Authors:

P Vaqueiro, AV Powell, S Hull, DA Keen
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Dynamic structural disorder in cristobalite: neutron total scattering measurement and reverse Monte Carlo modelling

Journal of Physics Condensed Matter IOP Publishing 13:3 (2001) 403

Authors:

Matthew G Tucker, Matthew P Squires, Martin T Dove, David A Keen
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