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Showing 1 to 14 of 14 for “"radiative relaxation"”.
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The Effects of Diabatic Heating on Storm Track Dynamics
… orography and diabatic processes including radiative relaxation, surface heating and condensational heating. Time-mean analyses of the statistically equilibrated eddy ensemble includes time-mean statistics, global spectral energetics, local energetics and wavepacket maps. Preliminary …
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Dissociation, relaxation, and oxidation of highly vibrationally excited gas phase metal carbonyl and cluster anions.
… of these quite different oxidation reactions. Radiative relaxation rate constants were also measured for Cr(CO)₅- and Al₁₆- using the oxidation branching ratio as an ion thermometric probe. A complementary value was determined for Cr(CO)₅- with a two-pulse photodissociation experiment, and …
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Let there be (more) light : a study of tungsten based 2D semiconductor-plasmonic hybrid structures
… limits its absorption capabilities and non-radiative relaxation channels reduce its quantum yield. In order to take full advantage of the optical properties of TMDs, these issues must be overcome. In this dissertation I will discuss work that focused on enhancing the emission of WS₂ and WSe₂ …
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Applications of fluorescence spectroscopy to environmental chemistry
… correlation is observed between kq and the non-radiative relaxation rate. These results confirm that nitroxyl radicals are very non-selective in their quenching abilities, and suggest that the best analytical probe adducts will include a fluorophore with an appreciable non-radiative relaxation …
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Optical properties of reduced graphene oxide : insights from ab initio and hybrid density functional theory
… to infrared wavelengths, with long calculated radiative relaxation times. A simple relationship between the predicted gap and size of the most symmetric quantum dot structures, which are also the most thermodynamically stable, is demonstrated.
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Intersystem crossing in acetylene : a mechanistic study
… tools, yielded mechanistic insights into the non-radiative relaxation (i.e. intersystem crossing) process that distributes the optically accessible bright state over the background of dark states. The potential of the IR-LIF signal as an indirect probe of the triplet states of acetylene has also …
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Experimental and Theoretical Analysis of the Luminescence Spectroscopy of atomic Mercury and atomic Manganese isolated in Rare Gas Solids
… accessed in absorption, provides multiple radiative and non-radiative relaxation channels for excited state populations. The luminescence spectroscopy of Hg and Mn atoms isolated in rare gas matrices has shown that the solid state environment provides an ideal environment to study the …
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Developing and Utilizing Gas-phase Laser Spectroscopy Techniques to Study the Effect of Desolvation on Molecules
… effect of solvent interactions on excited state relaxation pathway is discussed. Chapters 3 and 4 showcase the development in the use of Förster resonance energy transfer (FRET) as a tool for structural analysis of gas-phase proteins, focusing on ubiquitin ions as a model system. FRET …
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Photoacoustic imaging: development of near infrared platforms for non-invasive deep-tissue imaging
… occurs when optical excitation generates non-radiative relaxation through thermoelastic expansion, which produces sound waves that can be detected as ultrasound emissions. The PA signal is subject to minimal scattering in comparison to traditional fluorescence imaging, as sound scatters …
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Photoionization and excitation of free variable size van der Waals clusters in the inner shell regime
… clusters, which are assigned as sources of the radiative relaxation in the 280 nm regime. A fast energy transfer process (interatomic Coulombic decay, ICD) is assigned to be primarily the origin of these singly charged, excited cations besides intra-cluster electron impact ionization by Auger …
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Advanced simulations of cross-linked thermoset and conjugated polymers for multifunctional applications
… formalism are used to examine phonon-induced relaxation dynamics in the photoexcited state. The analysis reveals that, in undoped systems, electrons relax faster than holes, with light emission governed by both inter-band and intra-band transitions. The conductivity of cis-PA is further …
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To Couple or not to Couple? Exploring Vibronic Coupling in Organic Semiconductors
… metrics, including emission linewidth, radiative efficiency, charge separation rates, and non-radiative losses. The interaction between electronic excitations and vibrational degrees of freedom not only shapes energy conversion pathways but often dictates device efficiency limits. …
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Investigation of the Synthesis and Optoelectronic Properties of Ultrasmall CdSe Quantum Dots
… of NOM batches had the capability to alter QD radiative relaxation pathways and therefore the kinetics of NOM formation were investigated. Using a test matrix with a range of reaction temperatures (110-170 °C) and morpholine feed rates (250-1000 μL/hr), the rate law for the formation of NOM was …
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Phase-transition radiation of water
Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2011-11-20T20:09:30Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 1 Wang_Kuo-Ting.pdf: 1950213 bytes, checksum: efdbf4d6028389ef1af8e53e5e68a050 (MD5)