Department of Physics
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Computing the Arnold Tongue in the Zipoy-Voorhees Space-time
(Stellenbosch : Stellenbosch University, 2017-03)ENGLISH ABSTRACT : In this thesis I study the integrability of the geodesic equations of the ZipoyVoorhees metric. The Zipoy-Voorhees spacetime is a one parameter family of Stationary Axisymmetric Vacuum spacetimes (SAV’s) ...
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Methods for the radiological characterisation of the FiR 1 TRIGA research reactor decommissioning waste
(Stellenbosch : Stellenbosch University, 2017-03)ENGLISH ABSTRACT : Every nuclear reactor will eventually reach the end of its life time. With more than 60 new power reactors currently under construction, the need for understanding the safe decommissioning of a nuclear ...
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A near infrared femtosecond laser source for observation of charge transfer processes in semiconductors
(Stellenbosch : Stellenbosch University, 2017-03)ENGLISH ABSTRACT : Near infrared femtosecond laser pulses were generated in the spectral range 900 - 2400 nm using the idler of a noncollinear optical parametric amplifier (NOPA). The amplitude and phase of four exemplary ...
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Supercontinuum pulse characterisation and compression
(Stellenbosch : Stellenbosch University, 2017-03)AFRIKAANSE OPSOMMING : In hierdie projek word die infrastruktuur van 'n hoë-resolusie nie-lineêre mikroskoop ontwikkel. Spesifiek word daar gekyk na generering van breëband lig deur middel van 'n fotoniese-kristalvesel ...
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Fluorescence and self-absorption free excitation spectroscopy of carbon monoxide isotopomers in the vacuum ultraviolet
(Stellenbosch : Stellenbosch University, 2017-03)ENGLISH ABSTRACT : Carbon Monoxide (CO) is the most abundant heteronuclear diatomic molecule in the universe and has been of great interest in the fields of astrophysics and astronomy. CO is additionally, a prototype ...
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Quantum corrections to the kink-antikink potential
(Stellenbosch : Stellenbosch University, 2017-03)ENGLISH ABSTRACT : In quantum field theory vacuum polarization effects may drastically alter the classical properties of non-perturbative field configurations. This is especially the case when comparing the vacuum ...
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Control of CO2 vibrational dynamics via shaped-pulse coherent anti-Stokes Raman spectroscopy
(Stellenbosch : Stellenbosch University, 2017-03)ENGLISH ABSTRACT : In this work we investigate the coherent control of carbon dioxide (CO2) vibrational dynamics using Coherent anti-Stokes Raman Scattering (CARS). During CARS, vibrational modes are excited via stimulated ...
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Proton pencil beam kernels as extracted from Geant4 Monte Carlo simulations
(Stellenbosch : Stellenbosch University, 2016-12)ENGLISH ABSTRACT : The contribution of primary protons, secondary protons, heavy recoil ions, and other secondary particles to the total energy deposited in water by a proton pencil beam (in the therapeutic energy regime) ...
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Elemental Analysis of Mosses and Lichens from the Western Cape (South Africa) using INAA and ICP-MS
(Stellenbosch : Stellenbosch University, 2016-12)ENGLISH ABSTRACT : Mosses and lichens, analyzed by nuclear and related techniques, have been extensively used as biomonitors in the European countries to provide information about air quality, but not in South Africa. ...
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Ultrafast photochromism in metal-organic complexes
(Stellenbosch : Stellenbosch University, 2016-12)ENGLISH ABSTRACT : Dithizone (H2Dz), an analytical reagent typically used in colourimetric analysis, reacts with various transition metals to form metal dithizonate complexes. These complexes display strong absorption ...
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Search for the scissors resonance in 182Ta
(2016-12)ENGLISH ABSTRACT :Relatively small changes to the overall shape of the photon strength function such as the scissors or pygmy resonances can have a significant impact on reaction rates. Reaction rates are important for ...
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Charge carrier effects in free standing Si membranes investigated by linear and second harmonic optical techniques
(Stellenbosch : Stellenbosch University, 2016-12)ENGLISH ABSTRACT : Silicon (Si) based materials have been of technological importance throughout the years and today silicon remains a leading material in microelectronics industries. The silicon/silicon dioxide (Si/SiO2) ...
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Cave front tracking experiment
(Stellenbosch : Stellenbosch University, 2016-12)ENGLISH ABSTRACT : Seismic tomography, a procedure to trace seismic wave velocity variation, has been used for more than 100 years to “see through rock”. Initially the recording of seismic waves from natural sources ...
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Heavy baryons with strangeness in a soliton model
(Elsevier, 2015-09)We present results from a chiral soliton model calculation for the spectrum of baryons with a single heavy quark (charm or bottom) and non-zero strangeness. We treat the strange components within a three flavor collective ...
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Interplay of soundcone and supersonic propagation in lattice models with power law interactions
(Bristol : IOP Publishing, 2015-06-16)Westudy the spreading of correlations and other physical quantities in quantum lattice models with interactions or hopping decaying like r−α with the distance r.Our focus is on exponents α between 0 and 6, where the ...
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Higher-order interference and single-system postulates characterizing quantum theory
(Institute of Physics, 2014-12-10)We present a new characterization of quantum theory in terms of simple physical principles that is different from previous ones in two important respects: first, it only refers to properties of single systems without any ...
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Exchange-induced crystallization of soft-core bosons
(Institute of Physics, 2014-03-28)We study the phase diagram of a two-dimensional assembly of bosons interacting via a soft-core repulsive pair potential of varying strength, and compare it to that of the equivalent system in which particles are regarded ...
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Development of diode end-pumped Nd:YLF lasers at 1314 nm for high power operation
(Stellenbosch : Stellenbosch University, 2016-03)ENGLISH ABSTRACT : Please refer to the full text abstract.
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Novel implementation of a phase-only spatial light modulator for laser beam shaping
(Stellenbosch : Stellenbosch University, 2016-03)ENGLISH ABSTRACT : The phase-only spatial light modulator (SLM) has revolutionized the field of laser beam shaping. In this thesis we describe in detail the considerations necessary to build a “digital laser” which ...
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Middle-infrared laser sources
(Stellenbosch : Stellenbosch University, 2016-03)ENGLISH ABSTRACT : Both bulk solid-state mid-infrared lasers and amplifier systems based on Tm3+ and Ho3+, as well as mid-infrared optically pumped molecular gas lasers based on HBr were developed and studied. An efficient ...
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Development and characterisation of a Nd:YAG pumped wavelength tunable VUV light source
(Stellenbosch : Stellenbosch University, 2016-03)ENGLISH ABSTRACT : Please refer to the full text abstract.
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Surface enhanced Raman spectroscopy (SERS) of amino acids
(Stellenbosch : Stellenbosch University, 2016-03)ENGLISH ABSTRACT : Raman spectroscopy (RS) is an invaluable technique for sample identification. This method requires little sample preparation and is not completely non-invasive. The intensity of Raman scattered light can ...
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Development of a kHz optical remote sensing system for in situ insect monitoring
(Stellenbosch : Stellenbosch University, 2016-03)ENGLISH ABSTRACT : In this work we have developed a kHz optical remote sensing system for in situ insect monitoring applications. This is an active and passive remote sensing system based on laser and sunlight. This system ...
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Multiple chiral bands in 193Tl
(Stellenbosch : Stellenbosch University, 2016-03)ENGLISH ABSTRACT : In order to extend knowledge about chirality in A ∼ 190 mass region, experiments were performed at iThemba LABS for γ−spectroscopy studies in 192,193Tl. Previous level scheme of 193Tl was considerably ...
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Ultrafast dynamics of excitons in tetracene single crystals
(AIP Publishing LLC, 2014-03-18)Ultrafast exciton dynamics in free standing 200 nm thin tetracene single crystals were studied at room temperature by femtosecond transient absorption spectroscopy in the visible spectral range. The complex spectrally ...
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The design and construction of an active-target detector for the study of the 20Ne(α,α’)20Ne* reaction
(Stellenbosch : Stellenbosch University, 2015-12)
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Structural dynamics in DCNQI salts and transition metal dichalcogenides studied by electron diffraction simulation
(Stellenbosch : Stellenbosch University, 2015-12)ENGLISH ABSTRACT: An in-depth understanding of the working principles of and phenomena governing strongly correlated condensed matter materials has paved way for technological advancement in electronics in the recent ...
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Relativistic quantum mechanics on non-commutative spaces
(Stellenbosch : Stellenbosch University, 2015-12)ENGLISH ABSTRACT: A brief review of non-relativistic and relativistic quantum mechanics is carried out, with particular attention to concepts that are modified in the noncommutative setting. The Hilbert-Schmidt operator ...
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Biofilament interacting with molecular motors
(Stellenbosch : Stellenbosch University, 2015-12)ENGLISH ABSTRACT: We study molecular motors moving along a filament or polymer using two different mathematical models in which motors are idealised as springs. In the first model we study the average and the fluctuations ...
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Characterization of the pre-eminent 4-α cluster state candidate in 16O
(Stellenbosch : Stellenbosch University, 2015-12)ENGLISH ABSTRACT: Please see full text for abstract
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