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 37 for “"radiative decay"”.
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Photoproduction and Radiative Decay of ηt Meson in CLAS at JLAB
… m>m</em>(<em>π</em>+<em>π</em><em>−</em>), in the radiative decay mode <em>η</em><em>/ </em><em>→ π</em>+<em>π</em><em>−</em><em>γ </em>have been measured using the CLAS detector at the Thomas Jefferson National Accelerator Facility using tagged incident photons in the center-of-mass energy range …
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Radiative decay and level shift on an atom in an optical resonator
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1988.
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Observation of Eta-C and Other Structures in the Radiative Decay Psi to Gamma Eta Negative Pion Positive Pion
… at SPEAR was used to observe the exclusive radiative decay (psi) (--->) (gamma)(eta)(pi)('+)(pi)('-). The (eta)(,c) was seen as an intermediate state in this decay, (psi) (--->) (gamma)(eta)(,c), (eta)(,c) (--->) (eta)(pi)('+)(pi)('-). The product branching ratio B((psi) (--->) …
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Observation of eta-c and other structures in the radiative decay psi to gamma eta pi-plus pi-minus
… at SPEAR was used to observe the exclusive radiative decay [...] A spin-parity analysis was performed to determine the quantum numbers of the resonances responsible for this structure. However, the result was seen to be model dependent, so that it was not possible to conclusively resolve the …
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Measurement of the Branching Fraction and Search for Direct CP-Violation in the Radiative Decay B to K*Gamma with the BABAR Detector
Die hier vorgestellte Untersuchung des radiativen elektroschwachen "Pinguin"-Zerfalls B->K*(892)Gamma, der durch den "Schleifen"-Übergang b->sGamma stattfindet, stellt einen wichtigen Test des Standardmodells und einen Kandidaten für die Suche nach Neuer Physik dar. Der …
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Radiative lifetime of the B¹Σ⁺ and b³Σ⁺ states of carbon monoxide
"The radiative lifetimes of the B¹Σ⁺ and b³Σ⁺ excited states of carbon monoxide were measured at six different pressures: 10, 25, 50, 75, 100, and 125 microns of Hg. The lifetimes were obtained by observation of the radiative decay of the (0,0), (0,1), (0,2), and (1,1) bands of the Angstrom system …
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Measurement of chi (3510) and chi (3555) production in 190 gev/c piminus-beryllium interactions
… 1(3510) and X(3555) are seen through their radiative decay into J/psi , and are found to correspond to 0.29 +- 0.09 of total J/psi' production for J/psi's with xf > 0.2. The rate of production for the two X states appears as Ba(X(3555)/Bc(X(3510) = 0.60 + 0.35. The fraction of J/~'s produced …
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The effect of atmosphere on lead halide perovskites
… materials still suffer from substantial non-radiative decay, particularly under solar illumination conditions, and are therefore yet to reach their full potential. In this thesis, we demonstrate the use of light and atmospheric treatments on polycrystalline perovskite films, resulting in …
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Efficient Organic Light-emitting Diodes with Singlet, Triplet and Doublet Excitons
… as dark states due to their spin-forbidden decay process, whereas effective triplet harvesting or triplet circumvention can help to improve the OLED performance. In this thesis, methods and mechanisms to avoid loss pathways were explored from the spin management perspective, which is not …
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Measurement of Chi(3510) and Chi(3555) Production in 190 Gev/c Negative Pion-Beryllium Interactions
… and (chi)(3555)are seen through their radiative decay into J/(psi), and are found to correspond to 0.29 (+OR-) 0.09 of total J/(psi) production for J/(psi)'s with x(,f) > 0.2. The rate of production for the two (chi) states appears as B(sigma)((chi)(3555)/B(sigma)((chi)(3510) = 0.60 …
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Time resolved fluorescence of CdSe nanocrystals using single molecule spectroscopy
… dynamics that stem from fluctuations of non-radiative decay rates for the band edge exciton. Analysis of these fluctuations allows us to extract single exponential dynamics by sampling only "maximum-intensity" photons, and we find that this single exponential decay is remarkably uniform …
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Investigation of Multi-Photon Excitation in Argon with Applications in Hypersonic Flow Diagnostics
… that yields a long-lived metastable state via radiative decay. Our measurements were conducted over a range of pressures both with and without a krypton buffer gas. We compare our measured results to detailed calculations of the excitation pathway and describe the physical processes that govern …
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Observation of structure in the phi phi system produced in radiative J/psi decays
A sample of 4.9 million JI'I/J decays from the Mark III detector at SPEAR is used to study the radiative decay J I'I/J ---+ i¢¢. The decay is observed in two final states; iK+K-K+K-and the previously unobserved iK+K-K sKl. The new final state and an improved analysis of the all charged state allow …
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Multimodal Optical Interfaces Enabled by Multiresonant Plasmonics for Bio-Nanophotonics
… (LSPs), addresses these challenges by leveraging radiative decay for enhanced optical sensing (e.g., SERS) and non-radiative decay for nanoscale actuation (e.g., photothermal effects and vapor nanobubbles). Conventional plasmonic systems, however, are limited in wavelength multiplexing, …
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Experimental investigation of the dynamics of S1 benzene and the development of a new UV femtosecond pulse shaper
… shaper are presented. The non adiabatic non radiative decay process of benzene in its first excited has been determined using pump probe time resolved photoelectron spectroscopy. An ultrafast oscillation has been found at the onset of the channel 3 region which is attributed to intersystem …
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Near-Infrared Luminescent Lanthanide Complexes of Quinolinol Ligands: Structure/Properties Relationship
… a reliable quantitative description of the non-radiative decay processes induced by the dipolar coupling between quencher groups and the lanthanide ion. It has been also demonstrated that the ligand emission is significantly affected by the supramolecular interactions in the crystal packing. The …
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Optimizing the excited state processes of conjugated polymers for improved sensory response
… (TNT), electrostatically poised to induce non-radiative decay. The result is attenuation of the fluorescence signal characteristic of these bright polymers. Because energy migration is responsible for the amplification of sensory response, we sought to augment this migration by integrating …
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Components for quantum computing based on optical transitions in single quantum dots
… indistinguishable single photons, emitted by the radiative decay of the exciton state, are used to generate the input state for an integrated photonic two-qubit quantum logic gate. This is the first demonstration of a two-qubit gate using on-demand single photons. It is also the first …
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Advancing Photoacoustic Imaging Technology with Compact Source, Fluorescence Co-registration, Spectral Encoding, Matrix Detection and FRET
<p>Photoacoustic tomography, which detects non-radiative decay, is an emerging biomedical imaging modality that can provide 3D ultrasonically scalable images of biological tissue ranging from organelles to organs. Pure optical imaging modalities (e.g., optical coherence tomography and diffuse …
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Synthesis Of Alkylthiol-containing Fluorene Derivatives For Gold Nanoparticle Functionalization
… was developed gave enough scope for performing Radiative Decay Engineering (RDE) studies, in order to investigate the impact of gold nanoparticles on the singlet oxygen quantum yields of fluorene dyes that already exhibit high singlet oxygen quantum yields as well as high two photon absorption …
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