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 49 for “"blue-shift"”.
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BLUE-SHIFT OF EFFECTIVE BAND-GAP IN N-I-P-I DOPING SUPERLATTICES AS A FUNCTION OF OPTICAL EXCITATION INTENSITY
… of a n-i-p-i doping superlattice undergoes a blue-shift when the intensity of the external excitation light (pump) is increased. In other words, the luminescence peak arising from spatially indirect transitions (effective band-gap Eeffg) of a n-i-p-i structure shifts to a higher energy when …
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Modeling and Simulation of Optical Properties of Noble Metals Triangular Nanoprisms
… FDTD. Silver triangular nanoprism has exhibited blue shift on introduction of truncation and the blue shift continued further with depth of truncation. Similar observations were made for increase in thickness of nanoprism. In contrast, increase in edge length of the nanoprism has introduced a …
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Designing a nanoscale x-ray source: towards single molecule x-ray scattering
… is tuneable by exploiting the ionization-induced blue-shift that occurs in the waveguide. The X-ray source is designed for X-ray scattering experiments, which will ultimately allow the imaging of single biomolecules. Such experiments will require an intense, focused X-ray beam. Towards this aim, …
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Electronic absorption spectra of basic dyes containing terminal diethylamino and morpholino groups
… Green has been investigated. The observed red shift of the x-band arising from substitution of a methyl group into the ortho-position suggests that steric effects are shared between both rings and that electronic symmetry is maintained. However, introduction of one otho-trifluoromethyl group …
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Expression of cysteine-rich pig gastric mucin (Muc5AC) domains in Pichia pastoris and their pH-dependent properties
… decrease in the ANS peak emission wavelength (blue shift) indicating hydrophobic binding of ANS to the peptides. Similarly, decreasing the pH from 6 to 2 also caused an increase in the ANS fluorescence intensity and blue shift. Conversely, the intrinsic Trp fluorescence exhibited a decrease in …
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Mid-infrared antimonide based type II quantum dot lasers for use in gas sensing
… wavelength of these lasers showed first a blue shift followed by a red shift with increasing temperature, identical with the PL characteristics. Multimodal spectra were measured using Fourier transform infrared spectroscopy (FTIR). Spontaneous emission measurements below threshold revealed …
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Bose-Einstein condensation of excitons in uniaxially stressed Cu2O
… to 4 x lOs em/sec, roughly correlated with a blue-shift of 0.1 - 0.3 meV for the low-energy component of the paraexcitons. I therefore interpret the low-energy component of the paraexcitons as a Bose-Einstein condensation peak.
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Bose-Einstein condensation of excitons in uniaxially stressed cuprous oxide
… 10$\sp5$ cm/sec, roughly correlated with a blue-shift of 0.1-0.3 meV for the low-energy component of the paraexcitons. I therefore interpret the low-energy component of the paraexcitons as a Bose-Einstein condensation peak.
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Electrolyte Effects on the Kinetics of Comproportionation Electron-Transfer Reactions and on Intervalence Charge-Transfer Band Energies of Binuclear Ruthenium Ammine Complexes
… the energetics of optical electron transfer blue shift upon adding F<sup>-</sup> but red shift upon adding other halides. This interesting observation correlates with the known water structure “making” or “breaking” effects of the added halide anions</p>
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Aluminum-hydride formation in the relaxation zones following shock waves in the atmosphere of long-period variable stars
… lines behind the rising lower shock causes a blue-shift in their velocities, which has been observed. Any AlH absorption features which are detected should be red-shifted.</p>
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Advancing prostate cancer therapy: synthesis and characterization of docetaxel-loaded magnetic iron oxide nanoparticles for controlled drug release.
… absorption spectra with each attached molecule a blue shift was observed due to particle size increase. X-ray diffraction (XRD) pattern showed that pure magnetite nanoparticles were synthesized. The Fourier Transform Infrared (FT-IR) results showed a peak at 583, 1089, and 1584 cm-1 these …
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Molecular Solvation in Phosphonium Ionic Liquids
… The C153 steady-state data shows a systematic blue shift as PIL-Cl is added to solution. The system is at net higher energy at high mol fraction PIL-Cl implying that C153/PIL-Cl interactions are less favorable compared to C153/MeOH. The solute emission intensity is quenched most effectively at …
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Assessing ice storm damage to hardwood forest canopies using the Advanced Solid-State Array Spectroradiometer (ASAS) and Landsat TM imagery
… for nadir ASAS images were normalized and the blue shift of the red edge was represented as the radiance value at 714 nm (714nr). The 714nr for 210 sites in 3 damage classes differentiated severely damaged sites from moderately and lightly damaged sites. The classification map of 714nr in 3 …
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Simulating biochemical physics with computers
… argue the solvent effects on the solvatochromic shift of the n ! !* excitation of acetone in ambient and supercritical water fluid using a hybrid QM!CI/MM potential in MC simulations. The solute is described by the AM1 approach and water molecules are treated classically. Specially, the …
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Direct measure of band edge optical absorption of silicon nanostructures using photothermal deflection spectroscopy
… (PL) and PDS absorption spectra showed a blue shift with decreasing Si-NP size. An important outcome from this study is that a ~320 meV difference between the PL peak and absorption edge was observed which indicates that PL is a defect related process. The second part of the thesis …
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Study of Charged Liquid Cluster Beam Generation and Application to Processing of Thin Films and Nanoparticles
… Photoluminescence (PL) measurements indicated a blue shift of 4.5 nm corresponding to an 8-meV energy shift was observed due to quantum size effect. The CLCB technique was applied to the fabrication of ZnO thin films on silicon substrates with a thin layer of native oxide. The films were very …
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Design and Construction of Computer Based Instrumentation for Absorption and Fluorescence Spectroscopy With Applications to the Study of Environmental Effects on the Absorption Spectra of 6-Acyl-2-Naphthylamines
… instruments were used to study the spectral shifts of several 6-acyl-2-naphthylamines in several bulk solvents. The absorption shifts with temperature and pressure were also studied. Results showed a general red shift with increased polarity of solvent, as predicted from electrostatic …
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Quantum-confined Inorganic-organic Lead Halide Perovskite
… charge carriers interaction, revealing as a blue shift in photoluminescence and a faster radiative recombination process for MAPbBr3 perovskite inside nanopores. Due to the size distribution of MAPbBr3 nanocrystals inside nanopores, a transfer from high energy state to low energy state …
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Direct Observation of Laser Filamentation in High-Order Harmonic Generation
… of the imaged laser focus revealed a 4 nm blue-shift associated with the generation of plasma in the gas cell. The blue-shifting occurs primarily in the center of the laser beam and less at the wider radii. The initial laser pulse had a spectrum centered at 800 nm with a 35 nm bandwidth. …
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Synthesis and characterization of N-alkylthiourea and N, N -dialkylthiourea complexes of Cu, Cd and Pb, and their use as single source precursors for the synthesis of metal sulfide nanoparticles
… is a consistent property with the observed blue shift in the band edge of their optical spectra. Photoluminescence spectra of most samples were broadened with a red shift in relation to the band edge indicating the broad size distribution. Some relative quantity of bulk particles of copper …
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