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 1061 for “"Ionization"”.
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Electrohydrodynamic Ionization Mass Spectrometry
Made available in DSpace on 2014-12-13T20:10:32Z (GMT). No. of bitstreams: 1 7913522.pdf: 3974491 bytes, checksum: 59719994a36bcfa29226714fb033a0b8 (MD5) Previous issue date: 1978
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Photoassociative ionization in cold rubidium
… easily produced cold atoms. Photo associative Ionization (PAI) is presented as a means to study excited state molecular dynamics at large internuclear separation, including photo association. This thesis presents a number of techniques for studying PAI in cold rubidium and a number of results …
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Electron-impact ionization of molecules
"Electron-impact ionization of molecules has been a fascinating and intriguing subject for decades. For high incident-electron energy ( ̃thousand eV), the collision dynamics has been well described by the plane wave impulse approximation (PWIA) for most molecules. For intermediate and low …
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Solid-State Impact-Ionization Multiplier
… solid-state current amplifier based on impact-ionization. Unlike avalanche photodetectors which use the same amplification principle, this device can be integrated with any external current source. A discrete amplifier was built on a silicon surface using standard CMOS fabrication processes …
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Ionization in seeded detonation waves
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1960.
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Field ionization from carbon nanofibers
… theoretical current obtainable from the Field Ionization Array (FIA) by varying structural parameters in our device. The most relevant parameters include the radius of curvature, height, base radius and base angle of the grown tip; height and thickness of the tip; and the gate aperture. Varying …
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Portable high sensitivity ionization meter
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Physics, 1941.
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Pseudo-Molecular Ion Formation by Aromatic Acids in Negative Ionization Mode Electrospray Ionization Mass Spectrometry
… to most analyses performed by electrospray ionization mass spectrometry. These species are non-covalent complexes formed between an analyte of interest and any other components (such as mobile phase, additives, and impurities) present in the ionized sample band. Published literature …
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Nanowire sharpening : application to field ionization
… (and even at room temperature) the field ionization cross section of a nanowire array is significantly increased under certain conditions when taking into account DEP coupling.
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Microwave Triggered Laser Ionization of Air
… compared with classical and quantum theoretical ionization models at this short wavelength. A universal scaling analysis of these results allows one to predict some aspects of high power microwave (HPM) breakdown based on measured laser breakdown observations. The 1064 nm laser-induced effective …
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Strong Optical Field Ionization of Solids
… Our research explores two aspects of ionization in solids. (i) Current ionization theories neglect coupling between valence and conduction band and therewith the dynamic Stark shift. Our single-particle analysis identifies this as a potential reason for the different ionization …
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Electron impact excitation-ionization of molecules
… most difficult case to study is electron impact ionization of molecules for which many approximations have to be made and the validity of these approximations can only be checked by comparing with experiment.</p><p>In this thesis, I have examined the Molecular three-body distorted wave (M3DW) or …
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Impact Ionization in Charge Coupled Devices
… fabricated for the purpose of measuring impact ionization at the silicon-silicon dioxide interface. All past experiments have measured impact ionization either totally or partly in the bulk. Since the mobility of holes and electrons is lower at the interface than in the bulk, the impact …
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E-Region Ionization and Thermal Structure
Made available in DSpace on 2014-12-08T22:24:12Z (GMT). No. of bitstreams: 1 6711895.pdf: 5880066 bytes, checksum: f241cbc5036f9f5185671ceb3b150909 (MD5) Previous issue date: 1967
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Carbon nanotube-based field ionization vacuum
… volume being pumped. CNTs are ideal for field ionization because of their nano-sized diameter, high aspect ratio and of their robust chemical and mechanical structure. The ionizing CNTs are biased at a much higher electrical potential than the gate material surrounding it. Because of the high …
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An ionization chamber for fission fragment analysis
… a collaborator, we are building and testing an ionization chamber to be used for the SPIDER project which will ultimately take place at the LANSCE facility at Los Alamos National Laboratory. A full spectrum of the pertinent variables dictating the functionality of the ionization chamber have …
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ELECTRIC FIELD IONIZATION OF SODIUM RYDBERG ATOMS
… from the atom. The field strength at which this ionization happens is strongly dependent on the state of the Rydberg atom. Pulsed electric field ionization serves, therefore, not only as a means by which a Rydberg atom may be efficiently detected, but also a means by which the state of the …
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Ionization of air produced by strong shocks
"This dissertation provides theoretical predictions along with experimental results for electron concentrations behind a shock as a function of Mach number over a range from 11 to 20 using a combustion driven shock tube operating in air. These theoretical predictions represent an upper bound for …
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