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Title: Positronium fragmentation and dipositronium group symmetries
Author: Starrett, Charles Edward
ISNI:       0000 0001 3478 178X
Awarding Body: Queen's University Belfast
Current Institution: Queen's University Belfast
Date of Award: 2008
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Collisions of positronium (Ps) with the noble gases helium, neon, argon, krypton and xenon are considered in a two stage approach. Firstly, 'target elastic' collisions, where the noble gas target does not change state, are dealt with within the Impulse approximation. Secondly, collisions where the atom does change state, 'target inelastic' collisions, are considered within the first Born approximation. In both cases it is the spectra of ejected positrons and electrons that is the focus. Finally, isomorphism of the dipositronium (Ps2 ) symmetry group with the point symmetry group D2d is shown. Projection operators are obtained for collisional calculations of Ps with Ps.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available