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 28 for “"vibrational excitation"”.
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Experimental methods to examine the role of vibrational excitation in the singlet-triplet spin-orbit coupling in acetylene
… which is then coupled to the dense manifold of vibrational states in the T, 2 electronic states. A description of theories imperative to this study is provided and each is related to its application in experiment. A description of how to obtain important parameters in the coupling, such as the …
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Interactions of Kr(F₂), O₂, and (O₂)₂ with Si(100)
… Si is proposed to arise from localized vibrational excitation of the Si lattice as a result of the multiple collisions required to reverse the momentum of the heavier XeF₂ incident on the lighter Si lattice. This study is part of a series of experimental studies to test the hypothesis …
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Electron collisions and internal excitation in stored molecular ion beams
… experiments the role, which the initial internal excitation of a molecular ion can play in electron collisions, and the effect of these collisions on the internal excitation are investigated. Dissociative recombination (DR) and inelastic and super-elastic collisions are studied in the system of …
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Photoluminescence studies of hydrogenation and other defect-related processes in III-V compound semiconductors
… stimulated via recombination-enhanced vibrational excitation of acceptor-hydrogen complexes. A kinetic model that agrees with experimental data is proposed.
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Competition between Reaction Channels in Electron Collisions of the Hydrogen Molecular Ion HD+
… experiment, first evidence was observed for vibrational excitation of initially relaxed molecular ions being stored in a heavy-ion storage ring. These processes were attributed to collisions of the stored ions with slow electrons from the ring's electron cooling device, or with molecules from …
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On the Simulation of an All Electric Ship Powertrain Utilizing a Surface Piercing Propeller Via a Modular Main Propulsion Plant Model
… Simulation results provided insight into the vibrational excitation, stability, and control of such a powertrain.
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SPATIAL CHARACTERIZATION OF LASER FILAMENTS BY DETECTION OF SIGNATURES OF IONIZATION
… dynamics. We find evidence for a new impulsive vibrational excitation scheme which we introduce in this dissertation. Insight into the mechanisms of ionization is gained by consideration of the details of this process. In addition, the suitability of filaments to stimulate impulsive Raman …
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Vibrationally enhanced associative photodesorption of H2 (D2) from Ru(0001) : quantum and classical approaches
… a two-mode reduced dimensionality model with one vibrational coordinate and one translational coordinate of the adsorbate. The ground and excited electronic state potentials, and dipole function for the IR excitation are taken from first principles. The IR driven vibrational excitation of …
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Ultrafast Vibrational Dynamics of Water and Confined Water in Reverse Micelles
A fast vibrational energy transfer across the surfactant layer of AOT reverse micelles has been measured in small AOT reverse micelles (AOT/water/CCl 4). Most of the vibrational energy from nanodroplet water is transferred to the AOT head group and then out to the CCl4 within 10 picoseconds. The …
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Physical and Electrical Properties of Hot -Carrier Degradation of Silicon *Mos Transistors Processed in Deuterium and Hydrogen
… the deuterium isotope effect is due to multiple vibrational excitation of the Si-H/D bonds. The de-excitation or quenching process is mass dependent. The new mechanism is used to analyze the hot-carrier degradation characteristics of MOS transistors."
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The role of lattice excitation in Si etching
… of F₂ and XeF₂ with a fluorinated Si surface as vibrational excitation of the Si lattice, induced by the initial collisions of XeF₂ with the surface that enable a barrierless reaction of the fluorine carried on the Xe with the Si-Si bonds of the surface or lattice. The possibility of enhancement …
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Ab-initio molecular dynamics studies of laser- and collision-induced processes in multielectron diatomics, organic molecules and fullerenes
… of organic molecules (N2H2) and the giant excitation of the breathing mode in fullerenes (C60). In the second part, fullerene-fullerene collisions are investigated, for the first time in the whole range of relevant impact velocities concerning the vibrational and electronic energy transfer …
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Development of non-born-Oppenheimer methods for ground and excited state molecular properties
… the NEO framework. The results for nuclear vibrational excitations of interest corresponding to single or multiple protons calculated with NEO-TDDFT are accurate when the method is used in conjunction with large nuclear and electronic basis sets. Lastly, a scheme is presented for coupling …
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Molecular manipulation with the scanning tunnelling microscope
… that the switching process is driven by thermal excitation, but that the tip-adsorbate interactions play a role. The computational study of naphthalene 1,8-disulfide (NDS) in gas phase was performed by the density functional theory calculations using molecular orbitals. The S-S bond lengths of …
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The chemical dynamics of XeF₂ and Xe(F₂) reactions with Si(100)
… an abstraction event, with the Si. The second is vibrational excitation of the Si lattice, induced by the initial collisions of XeF2, thereby enabling reaction of the F atoms with the Si-Si bonds. The first chapter describes experiments investigating the chemical dynamics of the reaction of a beam …
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Dissociation, relaxation, and oxidation of highly vibrationally excited gas phase metal carbonyl and cluster anions.
… was used to study processes occurring in highly vibrationally excited metal-containing anions. The low-pressure environment of the FT-ICR trapping cell is optimal for the intentional study of nonthermal species. Vibrationally excited anions were prepared with well-defined excess internal energies …
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Energetics of neutral interstitials in germanium
… The first involves the calculation of the vibrational excitation spectrum of bcc helium-4, which was experimentally observed to contain unexpected optic-like branches. This is explained by the quantum vibrational properties of helium atoms where states with d or 2s symmetry form the optical …
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Sensitive and high-precision rovibrational spectroscopy of molecular ions relevant to astronomical and quantum chemistry
… laboratory measurements of rotational and rovibrational transition frequencies, which is particularly challenging for molecular ions. This is because ions are generated in small quantities within laboratory discharges, which are easily obscured by the far more abundant neutral molecules. This …
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Structural health monitoring of bridges using wireless sensor networks
… which are based on modal analysis under ambient vibrational excitation are often employed to detect structural damages of mechanical systems, many of such frequency domain methods as first step use a Fast Fourier Transform estimate of the Power Spectral Density (PSD) associated with the response …
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Xenon difluoride etching and molecular oxygen oxidation of silicon by reactive scattering
… to energy transfer and the duration of the vibrational excitation of the silicon-silicon lattice bonds. Computer simulations using this model suggest that the mass of the gas molecule does not affect the overall energy transferred to the silicon. However, the heavy mass and the resulting …
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