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 19 of 19 for “"oscillator strengths"”.
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Electric field effects on optical absorption by excitons in semiconductors
The effect of an electric field on exciton oscillator strengths is calculated for both bound and continuum states. The calculation is performed for Wannier excitons using the effective~mass approximation at both the Mo and M3 type edges. In comparison with single-particle theory, the inclusion of …
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Absolute molecular electronic spectroscopy at UV and soft X-Ray energies by hihg-energy electron impact
… been used to determine absolute photoabsorption oscillator strengths (cross sections) for electronic excitation of CC14, CH3OH, NH3, CH3NH2, (CH3)2NH, and (CH3)3N at energy resolutions in the range 0.048-1.0 eV fwhm. These data have been obtained in the valence, and inner shells (Cl 2p,2s; C is …
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Quasi-Two-Dimensional Phenomena at Aluminum-Gallium - Arsenide - Gallium-Arsenide Heterointerfaces: Multiple Quantum Wells and Modulation-Doped Structures (Superlattice, Modfet, Semiconductors)
… optical absorption coefficients and exciton oscillator strengths in AlGaAs-GaAs multiple quantum wells are greatly enhanced as well widths become narrower: this effect is in excellent agreement with recent calculation. Additionally acceptor energies in quantum wells are studied both …
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Electronic and optical properties of semiconductor quantum wells
… subband structure, exciton binding energies and oscillator strengths, and absorption spectra is undertaken using a multiband effective mass method which takes valence subband mixing into account. In addition the method is extended to study uniaxial stress and modulation doping effects. Finally, …
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Study of Plasmon Resonances in Single Photoionization of Carbon Fullerene Molecular Ions
… fits. Resonance parameters such as lifetimes and oscillator strengths were calculated and compared. Results for the photoionization of C60+ were compared to previously reported measurements. At higher photon energies, single photoionization accompanied by fragmentation of carbon pairs becomes …
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Calculated and measured line intensity ratios of singly and doubly ionized nitrogen atoms in hydrogen plasma
The oscillator strengths of several NII and NIII lines in the optical wavelength region are calculated by means of the Coulomb approximation. Atomic processes in a plasma are discussed, as well as two models (LTE and semi-coronal) which can be used to determine the line intensity ratios of …
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Radiative and predissociative lifetimes of the A²Σ⁺ state of OH
… with relative intensity measurements to obtain oscillator strengths"--Abstract, page iii.</p>
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Quasi-two-dimensional phenomena at AlGaAs-GaAs heterointerfaces, multiple quantum wells and modulation-doped structures
… optical absorption coefficients and exciton oscillator strengths in AIGaAs-GaAs multiple quantum wells are greatly enhanced as well widths become narrower: this effect is in excellent agreement with recent calculation. Additionally acceptor energies in quantum wells are studied both …
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Photostabilization of J-aggregate cyanine dyes for exciton-polariton based devices
… possess large exciton binding energies and huge oscillator strengths that have allowed for the creation of room temperature polariton condensates, superfluids, and other exotic phenomena. Using J-aggregates, the aggregated form of cyanine organic dyes, we have previously fabricated light-emitting …
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Structural, electronic and optical properties of cadmium sulfide nanoparticles
… give rise to less pronounced spectra with lower oscillator strengths. Finally, a very good agreement of the calculated data to experimentally available spectra and excitation energies is found.
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Chemical gradients in the Milky Way from unsupervised chemical abundances measurements of the RAVE spectroscopic data set
… atmosphere parameters adopted (in particular the oscillator strengths of the absorption lines and the effective temperature, gravity, and metallicity of the stars measured). Therefore we first identified 604 absorption lines in the RAVE wavelength range and refined their oscillator strengths with …
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Tune-out Wavelength Measurement and Gyroscope Using Dispersion Compensation in an Atom Interferometer
… test for atomic structure calculations of line strengths, oscillator strengths, and dipole matrix elements. I present a new measurement of the longest tune-out wavelength in potassium, λzero = 768.9701(4) nm. To reach sub-picometer precision, an optical cavity surrounding the atom beam paths of …
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Absorption and luminescent excitation spectra of F and M centers in Kcl and NaF
… of the Ml to M2 transitions was 1.2 ± .25. The oscillator strengths of 3 of the M-center transitions in KCl relative to the oscillator strength for the F center were found to be in better agreement with the results reported by Okamoto, than with the results reported by Delbecq. The polarization …
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Nanoscale light-matter interaction of ultrathin materials
… materials offer unique advantages: large oscillator strengths and tunable electro-optical properties by seamless stacking into hybrid platforms. In this cumulative thesis, we develop a unified microscopic framework to explore light–matter interactions in such hybrids when electric fields …
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Oscillator strength measurements in singly-ionized, doubly-ionized and neutral lanthanides and transition elements (sm, nd, pr, gd, cu, and fe) using laser-induced breakdown spectroscopy.
… to calculate transition probabiliites and oscillator strengths.</p> <p>In two transition metals, emission intensities have been measured for 192 transitions from 108 excited states in neutral copper and 27 emission lines from 108 excited states in singly-ionized copper as well as 776 …
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Analysis of Mueller matrices of metamaterials and multiferroics
… = [epsilon]([omega]_h)*S_m for the oscillator strengths S_{e(m)} explains the observed vanishing of certain hybrid modes at [omega]_h in reflectivity. Electromagnetic wave propagation and the spectra of optical excitations in complex materials are modeled. Analytical expressions for …
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Redox properties of Bis-Triarylamines and ligand properties of Thianthrenophane
… with the experiments but differ strongly for the oscillator strengths as well as for neutral compounds and their corresponding mono radical cations. The small solvent dependence of the experimental UV/Vis spectra in CH2Cl2 and MeCN reflects a minor charge transfer character of the electronic …
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The Electronic and Vibrational Spectroscopy of Matrix-Isolated Phthalocyanines – Experiment and Theory
… N-H bonds. The vertical excitation energies and oscillator strengths of H2Pc and ZnPc as well as those of free-base and zinc tetraazaporphyrin (TAP), tetrabenzoporphyrin (TBP) and porphine (P) have been calculated with linear-response time-dependent DFT utilizing the B3LYP hybrid functional and …
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The Electronic and Vibrational Spectroscopy of Metal Phthalocyanines and Metal Phthalocyanine Chlorides Isolated in Low Temperature Solids
… each host. The vertical excitation energies and oscillator strengths of GaPcCl (as well as a number of other M-Pc and M-TAP molecules) are calculated with TD-DFT utilizing the B3LYP hybrid functional and 6-311++G(2d,2p) basis set. The theoretical results correctly predict the trend of the strong …