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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 16 of 16 for “"Low ion"”.
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Low ion dose imaging in the Helium Ion Microscope under Neyman Type A statistics
The Helium Ion Microscope (HIM) is a new tool capable of imaging at resolutions not possible in the ubiquitous Scanning Electron Microscope (SEM). However, along with this improvement in imaging, the helium ions used in HIM cause greater damage to samples. Reducing ion doses decreases the amount of …
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Material sputtering at low ion energies: From atomistics to engineering models with molecular dynamics, Monte Carlo, and data-driven approaches
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-03-28 without embargo terms
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Photo-Assisted Etching in Halogen Containing Plasmas
… to precisely pattern feature with lateral dimensions of <10 nm. To advance this capability to etch layers with atomic fidelity, while also achieving ultra-high material selectivity, low ion energies (10s eV) are required. However, at low ion energies, an alternative etching pathway catalyzed by …
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Laser-trapped Atoms as a Precision Target for the Heavy-Ion Storage Ring TSR
… neglected they are ideally suited to study collisions with stored heavy ions at energies of some MeV/u. Measurements of collision cross sections for ionization of the target atoms are carried out and the results are compared to theoretical predictions. Additionally, the transfer of electrons from …
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Development of a sensitive mid-infrared spectrometer for the study of cooled molecular ions
The study of molecular ions is relevant to many areas of scientific interest. Mid-infrared laser spectroscopy functions as a useful tool for understanding the role of molecular ions in these areas. To this end, a broadly tunable mid-infrared difference frequency generation noise-immune …
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R-matrix calculations in support of diagnostics for fusion and astrophysical plasmas
… analyse models which describe collisional processes involving neutral molybdenum (Mo I), neutral tungsten (W I), singly ionised iron (Fe II), and neutral iron (Fe I). While atomic data for the neutral stages of molybdenum and tungsten finds an important application when investigating …
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Synthesis and Non-Covalent Interactions of Novel Phosphonium-Containing Polymers
Phosphonium ions readily compare to ammonium ions in regards to their aggregate characteristics, thermal stability, and antibacterial activity. Ionic aggregation in phosphonium-based polymers provides thermoreversible crosslinks, ideal for reversible self-assembly, self-healing, and smart response. …
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Synthesis and characterization of phosphorous containing macromolecular polyether compounds
… <sup>82</sup>Rb is used in positron emission tomography. Neutral crown ethers and cryptands have been studied as carrier ligands for Rb<sup>+</sup> but exhibit low ion carrying capacity and high toxicity. The present study involved investigating a lariat ether containing an ionizable …
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Enhanced Electrospray Ionization for Mass Spectrometry and Ion Mobility Spectrometry
Electrospray ionization (ESI) has become one of the most commonly used ionization techniques for mass spectrometry (MS) and ion mobility spectrometry (IMS), and efforts continue to improve its performance. ESI-MS is most recognized for its wide application to biomacromolecules where high …
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Synthesis and characterization of aminated perfluoro polymer electrolytes
… electrolytes have been developed for use in anion exchange membrane fuel cells for years. However, due to the highly corrosive environment within these fuel cells, poor chemical stability of the polymers and low ion conductivity have led to high development costs and thus prevention from …
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Mechanisms for Orientation in Low Energy Ion Beam Assisted TiAlN Thin Film Growth
<p>The effects of off-normal ionized vapor bombardment on the orientation and structure of off-normal sputter deposited TiAlN thin films has been investigated with the goal of better understanding the mechanistic pathways in ion beam assisted thin film growth for better control of film properties …
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MODELING QUANTUM AND COULOMB EFFECTS IN NANOSCALE ENHANCEMENT-MODE TRI-GATE III-V MOSFETs
… However, there are several challenges (such as, low ION/IOFF ratio) associated with III-V MOSFETs that prohibit their use in high- performance and low-power logic applications. To address some of these challenges, in this work, we investigate the performance of tri-gate III-V FETs (with 18nm and …
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Understanding the mechanism of salt tolerance in alfalfa (Medicago sativa L.)
… hay, silage, dehydrated products, seed production, and soil improvement. Alfalfa is moderately tolerant to salinity, but its productivity decreases under saline growth condition. Understanding of the salt tolerance mechanism and identification of genes responsible for salt tolerance is critical …
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Design, construction, and characterization of an ultra-sensitive, high-precision fast ion-beam spectrometer for the study of molecular ions
This dissertation details the design, construction and characterization of a sensitive, fast ion beam spectrometer to record the absorption spectra of molecular ions. It is the first work to use the noise immune cavity-enhanced optical heterodyne molecular spectroscopy (NICE-OHMS) technique in …
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Development of a portable microfluidic system for monitoring ions river water
… by environmental changes and industrialisation. The presence of various nutrient contaminants in surface water poses a serious threat to human health. The initial step for the development of this predictive model is to have an in situ monitoring system that provides high frequency screening …
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Characterisation of focused ion beam nanostructures by transmission electron microscopy
Ion irradiation is an effective tool for the modifcation and control of the properties of magnetic thin films. Basic magnetic properties such as coercivity and local anisotropy direction can be altered in NiFe (Permalloy) films, whilst for Co/Pd multilayers, ion irradiation results in a transition …