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 62 for “"impact-ionization"”.
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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 …
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Impact Ionization in Charge Coupled Devices
… and 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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Impact ionization and high-field transport in semiconductors
… special emphasis, the phenomenon of impact ionization. Both the ionization rate itself and its effect on bulk semiconductor transport are computed by a full-band Monte Carlo algorithm for Si and several III-V materials. Furthermore, a new interpretation of hot carrier luminescence …
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Electron impact ionization cross sections for carbon vapor.
Massachusetts Institute of Technology. Dept. of Electrical Engineering. Thesis. 1970. Ph.D.
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An Experimental Study of Impact Ionization in Compound Semiconductors
Impact ionization coefficients are important parameters for the understanding of high field transport in semiconductors. Previous experimental data on impact ionization coefficients have indicated that the bandstructure can have a strong influence on the impact ionization process. In this thesis, …
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Accuracy of theory for calculating electron impact ionization of molecules
<p>The study of electron impact single ionization of atoms and molecules has provided valuable information about fundamental collisions. The most detailed information is obtained from triple differential cross sections (TDCS) in which the energy and momentum of all three final state particles are …
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Theoretical calculations for electron impact ionization of atoms and molecules
… made for the theoretical treatment of electron impact ionization (e,2e) of atoms and molecules and, for some cases, very nice agreement between experiment and theory has been achieved. In particular, excellent agreement between theory and experiment and theory has been achieved for ionization of …
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Computer Calculations of Cross Sections for Electron Impact Ionization of Helium
Triple differential cross sections for electron-impact ionization of helium are calculated in the distorted wave approximation. The distorted wave formalism is discussed for the z-axis parallel to the momentum transfer direction. Problems associated with programming this formalism are outlined. The …
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The Experimental Determination of Impact Ionization Coefficients in Gallium-Arsenide and Indium Phosphide
Embargo set by: Seth Robbins for item 78563 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs
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The experimental determination of impact ionization coefficients in gallium arsenide and indium phosphide
Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-09T18:20:16Z No. of bitstreams: 1 1983_bulman.pdf: 7262557 bytes, checksum: 5e01c853d20714818374ece7733a0de6 (MD5)
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Modeling and engineering impact ionization in avalanche photodiodes for near and mid infrared applications
… The origin of the APD's internal gain is the impact ionization process. However, due to the stochastic nature of the impact ionization process the multiplication gain comes at the expense of extra noise. This multiplication noise is called the excess noise, and it is a measure of the gain …
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Miniaturized electron-impact-ionization pumps using double-gated isolated vertically aligned carbon nanotube arrays
… and the chamber volume, resulting in enhanced ionization and pump rates. Therefore, scaled-down ion pumps are a promising choice for a variety of applications including portable mass spectrometers and sub-mm wavelength vacuum amplifiers. Our micropump architecture consist of a field-emission …
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Solution Kinetics and Impact Ionization in the Indium-Gallium - Arsenide Phosphide Alloy System (Crystal Growth, Photodetectors)
… Chapter III covers the device processing and impact ionization measurements in (111) InP. The techniques for successful polishing and mesa etching in the (111)A InP are reviewed. These advances in the processing of the (111)A surface have been used to fabricate high quality avalanche …
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New insights in impact ionization and in time-of-flight mass spectroscopy with micrometeoroid detectors by improved impact simulations in the laboratory
The present thesis deals with the impact ionization processes appearing at hypervelocity impacts of microparticles on solid surfaces. With a newly developed dust particle source, applied to the Heidelberg Dust Accelerator facility, aluminium, carbon, sodium contaminated carbon, iron and latex …
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Theoretical Studies of High Energy Transport of Electrons and Holes in Gallium-Arsenide, Indium-Phosphide, Indium-Arsenide, and Gallium-Antimonide (Semiconductors, Monte Carlo, Impact Ionization)
In this thesis, the high field behavior of both electrons and holes is studied using a Monte Carlo calculation including a complete band structure. The Monte Carlo method is particularly useful since it can be applied to both steady state and transient problems.
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Modeling optically activated high power semiconductor switches
… effects in the model include band-to-band impact ionization, trap impact ionization, photoionization, recombination radiation transport, and negative differential resistance. The model has the ability to address different switch geometries and the consequences of nonuniformities in carrier …
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Electron impact excitation-ionization of molecules
… the study of atomic collisions by electron-impact has made significant advances. The 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 …
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Modeling and Observation of He+ Pickup Ions in the Inner Heliosphere
… the heliosphere. They are produced by photoionization, charge exchange with solar wind ions, and electron impact ionization (EI). Once ionized, they are picked up by the interplanetary magnetic field (IMF) and rapidly swept outward with the solar wind. Typically, pickup ion distributions …
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Internal and External Vibrations of Weakly Bound Molecular Complexes: Infrared Spectroscopy and Vibrational Analysis
… mass selective detection which employs electron impact ionization and quadrupole mass filtering. A Nd:YAG-pumped optical parametric oscillator (OPO) provided tunable infrared radiation in the 2.5 to 3.5 $\mu$ region.
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