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dc.contributor.advisorKjaergaard, Niels
dc.contributor.advisorLongdell, Jevon
dc.contributor.authorThomas, Ryan James
dc.date.available2017-12-05T20:00:46Z
dc.date.copyright2017
dc.identifier.citationThomas, R. J. (2017). Cold Collisions of Ultracold Atoms (Thesis, Doctor of Philosophy). University of Otago. Retrieved from http://hdl.handle.net/10523/7776en
dc.identifier.urihttp://hdl.handle.net/10523/7776
dc.description.abstractThis thesis describes experiments investigating the collisions of alkali metal atoms at energies between 10 - 2000 uK, measured in units of the Boltzmann constant. The atoms are accelerated towards each other using a purpose-built collider comprised of a crossed-beam optical dipole trap, which enables us to collide dense ensembles of ultracold atoms in any internal state at relatively high energies. I present the results of two experiments centered around resonant enhancement of the collisions. The first is between homonuclear 40K atoms near a shape resonance where the fermionic nature of the atoms determines the character of multiple scattering effects. The second experiment involves heteronuclear 40K87Rb collisions near a magnetically-tunable Feshbach resonance where we measure parameters describing the resonance as a function of collision energy. Theoretical models are developed that let us describe the collisions using published empirical interaction potentials, and we find good agreement between these models and the experiment.
dc.format.mimetypeapplication/pdf
dc.language.isoen
dc.publisherUniversity of Otago
dc.rightsAll items in OUR Archive are provided for private study and research purposes and are protected by copyright with all rights reserved unless otherwise indicated.
dc.subjectphysics
dc.subjectbose-einstein condensation
dc.subjectatomic collisions
dc.subjectrubidum
dc.subjectpotassium
dc.subjectcoupled-channels equations
dc.subjectfeshbach resonances
dc.subjectshape resonances
dc.titleCold Collisions of Ultracold Atoms
dc.typeThesis
dc.date.updated2017-12-05T03:05:25Z
dc.language.rfc3066en
thesis.degree.disciplinePhysics
thesis.degree.nameDoctor of Philosophy
thesis.degree.grantorUniversity of Otago
thesis.degree.levelDoctoral
otago.openaccessOpen
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