Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 89 for “"Atomic, Molecular and Optical Physics"”.
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Light Scattering in Ultracold High Density Rubidium Vapor
<p>Recent developments in laser cooling and trapping opened the door to a world full of new opportunities for research in atomic, molecular and optical physics as well as condensed matter physics. It became possible to do experiments under conditions that are hard to achieve in condensed matter …
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Precision Metrology with Ytterbium Ions for New Physics Search
Modern physics faces a growing discrepancy between the success of the Standard Model and the body of evidence pointing to the New Physics beyond it. A powerful method of New Physics searches is using quantum sensing tools based on Atomic, Molecular, and Optical physics. In particular, the modern …
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Theory of density functionals
… theory. The most appealing for its simplicity and rigor is the theory of Kohn and Sham. In this thesis I propose new methods in density-functional theory that are helpful to address some important problems in the application of the local-density approximation within Kohn-Sham DFT to the …
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Quantum mechanics in complex systems
… there are three distinct topics contained within and three distinct chapters within the body of works. In a similar fashion, this abstract should be considered in three parts. Firstly, we explored the existence of multiply-charged atomic ions by having developed a new set of dimensional scaling …
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Using coherence and interference to study the few body dynamics in simple atomic collisions systems
<p>"Atomic Collision experiments are best suited to sensitively test the few-body dynamics of simple systems. The few-body dynamics, in turn, can be sensitively affected by interference effects. However, an important requirement to observe interference effects in atomic scattering experiments is …
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Excited-State Magnesium-Rare Gas Optical Collisions
<p>Polarization and intensity spectra have been obtained for excited-state magnesium (3s3p <sup>1</sup>P<sub>1</sub>) - rare gas optical collisions. The magnesium was excited by a linearly polarized laser tuned to the 3s<sup>2</sup>1s<sub>0</sub> → 3s3p <sup>1</sup>P<sub>1</sub> atomic transition …
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Efficient and coherent frequency conversions and nonlinear interference in optical parametric and atomic Raman processes
… high-frequency photon to a low-frequency photon and connect a missing link in quantum networks. ^ Coherent and efficient nonlinear interaction and frequency conversion are of great interest in many areas of quantum optics. Traditionally, the low efficiency of Raman scattering is improved by a …
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Close-Coupling Calculations for NaAr, NaNe, and NaHe
… close-coupled theory, developed by Mies and by George, is employed in a time-independent molecular calculation for Na-rare gas collisions in a radiations field. The intensity of the Na D1/D2 lines is calculated for both blue- and red-wing excitation and is in good agreement with the …
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Experimental constraints on exotic spin-dependent interactions using specialized materials
… 0 boson to spin 1/2 fermions through scalar (gs) and pseudoscalar (gp) couplings. We discuss two experiments that can investigate these interactions using nucleon rich, impressively low magnetic susceptibility (5-100 times lower than pure water) test masses and electron-spin rich, polarized test …
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A Theoretical Model for Calculation of Molecular Stopping Power
… on the work of Linhard-Winther, Bethe, Brown, and Walske is established. The Gordon-Kim's molecular charged density model is employed to obtain a formula to evaluate the stopping power of many useful molecular systems. The stopping power of H<sub>2</sub> and He gas was calculated for incident …
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Partial Radiative Recombination Cross Sections for Excited States of Hydrogen
… permit recombination into highly excited states and the "effective size" of the atom is not much less than the wavelength of the emitted photon. These physical conditions do not meet the requirements for making the dipole approximation. A higher order approximation is to keep an additional term …
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The Straggling Green's Function Method for Ion Transport
… been conducted on developing a concise theory and method for HZE ion transport capable of being validated in the laboratory. Previous attempts have ignored dispersion and energy downshift associated with nuclear fragmentation and energy and range straggling. Here we present a Green's function …
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Optical Properties of Type III-V Semiconductor Spherical Quantum Dot Heterostructures
… Such applications include high speed optical communication lasers, infrared photodetectors, and single photon emitters. One promising immediate application is QD solar cells. Proper analysis of the optical absorption characteristics in these solar cells requires a rigorous modeling of …
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Two-Photon Quantum Interference Polarization Spectroscopy: Measurements of Transition Matrix Elements in Atomic Rubidium
… the adequacy of theoretical calculations on the atomic structure requires availability of the precise experimental data on radiative properties of the atoms. Such data is also required in astronomy and some important areas of technology. The lack of precision of traditional spectroscopic studies …
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Optical Excitation of Metastable Krypton and Photoassociative Spectroscopy of Ultracold RbAr
… bodies of work. In the first, we investigate all-optical excitation methods to produce metastable-state krypton. The high energies required to excite rare gases out of their ground state present a unique challenge in the context of laser experiments. Laser physics work with rare gases often relies …
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Experimental Investigation of a Rubidium-Argon Dual Species Magneto-Optical Trap
<p>The first simultaneous cooling and confinement of two different atomic species from opposite sides of the periodic table in a dual magneto optical trap (DMOT) has been accomplished. The alkali-metal <sup>85</sup>Rb and the noble gas <sup>40</sup>Ar* have been simultaneously confined, …
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Theoretical Investigation of Two-Color, Two-Photon, 6s(2)S(1/2) → 5d(2)D(j) → 11p(2)P(3/2) Excitation and Depolarization Spectra in Atomic Cesium
… investigation of two-photon, two-color intensity and depolarization spectra for the 6s<sup>2</sup>S<sub>1/2</sub> → 5d<sup>2</sup>D<sub>j</sub> → 11p<sup>2</sup>P<sub>3/2</sub> transition in atomic caesium is considered. For quadrupole-dipole transitions the dependence of excitation from the ratio …
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