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 8 of 8 for “"Polarization spectroscopy"”.
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Two-Photon Quantum Interference Polarization Spectroscopy: Measurements of Transition Matrix Elements in Atomic Rubidium
… by means of the two-photon quantum interference polarization spectroscopy. A two-photon polarization spectrum of the rubidium atom is obtained in the range of detunings -417 cm<sup>-1</sup> to +99 cm<sup>-1</sup> from atomic 5s<sup>2</sup>S<sub>1/2</sub>-5p …
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Investigation of Degenerate Four -Wave Mixing and Polarization Spectroscopy for Quantitative Measurements in Combustion Environments
… calculations of OH concentration. The polarization dependence of the P1(2) and R2(l) DFWM transitions was investigated, providing experimental confirmation that the signal penalties predicted by a perturbative treatment of DFWM can be much less when the resonances are saturated.
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Detection and spectroscopy of single CdSe nanocrystallite quantum dots
… time or by adding an applied electric field. Polarization spectroscopy is used to probe the nature of the transition dipole from the emitting state, uncovering a degenerate dipole that is oriented isotropically in the x-y plane of the nanocrystallite. The 2-dimensional nature of this dipole …
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Development of Laser-Spectroscopic Techniques for New Detection Schemes in Combustion Diagnostics
… discussed. A second area considered was use of polarization spectroscopy (PS) to probe species relevant to combustion. The CH radical was studied in a low-pressure methane/oxygen flame and compared with laser-induced fluorescence (LIF) measurements acquired simultaneously. Atomic hydrogen was …
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Development of a Single-Crystal X-ray Spectropolarimeter and Application to Wire-Array Z-pinches
… from the observation of hard x-ray bursts. Spectroscopy is the way to diagnose plasmas, and because anisotropies such as electron beams can lead to the partial polarization of the emitted radiation, polarization spectroscopy, or spectropolarimetry, can be used to diagnose these environments. …
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Optimizing the excited state processes of conjugated polymers for improved sensory response
… with increased energy migration through polarization spectroscopy. In Chapter 4, we extend this paradigm for elongating energy migration in conjugated polymers to several other systems. Unique polymers with symmetric, aromatic chromophores are investigated. These materials allow us to …
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Synthesis of Highly Ordered Polymer Nanostructures Based on Polyphenylene Vinylenes (PPVs)
… chromophore polymers. Single-molecule excitation polarization spectroscopy confirmed these bulk measurements by showing the longer chromophore containing polymers (septamer) adopted more anisotropic nanostructures than the shorter chromophore polychromophores (trimer and pentamer) and indicates a …
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Measurement of Hyperfine Coupling Constants of the 5d²D₃/₂ and 5d²D₅/₂ Levels in Atomic Cesium Using Polarization Quantum Beat Spectroscopy
… pump-delayed-probe method based on quantum beat spectroscopy has been used. Cesium atoms are prepared by a short, resonant light pulse ( the pump) in a superposition of excited hyperfine levels ( 5d<sub>2</sub>D<sub>1/2</sub> or 5d<sup>2</sup>D<sub>5/2</sub>) through an electric quadrupole …