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Title: The study of condensed matter by deep inelastic neutron scattering
Author: Evans, Alan Charles
Awarding Body: University of Warwick
Current Institution: University of Warwick
Date of Award: 1993
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This thesis describes the technique of electron-volt neutron spectroscopy at the pulsed spallation neutron source ISIS at the Rutherford Appleton Laboratory. A number of systems were studied, with the emphasis on the validity of the impulse approximation in each case. Assuming a Gaussian momentum distribution, the mean kinetic ener­gies of ZrHj, ZrD2, NbH and NbD and lithium metal between 20 K and 300 K were measured. By numerical calculation, it is shown that anharmonicity in metal hydride systems can be dealt with in terms of a Gaussian momentum distribution, as for har­monic systems. The vibrational density of states of H in ZrH2 was determined from inelastic neutron scattering measurements of the dynamic structure factor made on the MARI spectrometer, and used to perform exact numerical simulations of eVS mea­sured neutron Compton profiles for a range of momentum transfers. The deviations of these simulated data from the impulse approximation due to final state effects were compared to deviations from the impulse approximation of data measured on eVS. It is shown that these deviations are small enough to be treated by a straightforward correction procedure.
Supervisor: Not available Sponsor: Science and Engineering Research Council
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: QC Physics