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 387 for “"ion-beam"”.
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Nanofabrication using focused ion beam
Focused ion beam (FIB) technique uses a focused beam of ions to scan the surface of a specimen, analogous to the way scanning electron microscope (SEM) utilizes electrons. Recent developments in the FIB technology have led to beam spot size below 10 nm, which makes FIB suitable for nanofabrication. …
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Mechanism of ion beam induced deposition
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1990.
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Scanned Ion Beam Therapy For Thoracic Tumors
… adolescents and young adults can develop radiation induced second cancers. These patients could potentially benefit from scanned ion radiotherapy yet likely would require motion mitigation strategies. In theory, four-dimensional (4D) optimization of ion beam fields for individual motion states …
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Ion Beam Mixing of Metal/Fluoropolymer Interfaces
The adhesion of metals to polymers depends on the structure at the interface. In this work, we study the "mixing' effect of 50 keV nitrogen implanted thin metal layers on Teflon PTFE (polytetrafluoroethylene). RBS analysis shows that thin layers copper and chromium approximately 300-400 Å thick …
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Ion-beam processes in group-III nitrides
… InGaN, and AlGaN) are important for the fabrication of a range of optoelectronic devices (such as blue-green light emitting diodes, laser diodes, and UV detectors) as well as devices for high-temperature/high-power electronics. In the fabrication of these devices, ion bombardment represents a …
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Ion-beam processes in group-III nitrides
… InGaN, and AlGaN) are important for the fabrication of a range of optoelectronic devices (such as blue-green light emitting diodes, laser diodes, and UV detectors) as well as devices for high-temperature/high-power electronics. In the fabrication of these devices, ion bombardment represents a …
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Josephson Junctions Fabricated by Focussed Ion Beam
… on an innovative new approach to Josephson junction fabrication. These junctions are created in low TC superconductor-normal metal bilayer tracks on a deep submicron scale using a Focused Ion Beam Microscope (FIB). The FIB is used to mill away a trench 50_nm wide in the upper layer of niobium …
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Focused ion beam assisted deposition of gold
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1986.
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Focused ion beam induced deposition of copper
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1993.
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High current coaxial ion beam/laser beam spectrometer
The construction and operation of a new apparatus for making spectroscopic investigations of molecular ions is described. In the new ion beam machine, the ion beam and laser beam overlap in a coaxial geometry. The machine has much higher ion current than an apparatus previous used. The laser beam …
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Processing Ion Beam Mixed Nickel/Polyimide Thin Films
We have established a method of fabrication for Nickel/Polyimide ion beam-mixed films using thermal evaporation. We then used the low-temperature characterization system in the Materials Physics Testing lab at SMSU to measure the resistance of each film as a function of temperature. These methods …
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Focused Ion Beam Fabricated Non-equilibrium Superconducting Devices
The developments over the last decade in Focused Ion Beam (FIB) instrument technology have reached a point where there is sufficient control of an ion beam to make cuts, trenches, and other shapes in a sample on a scale of tens of nanometers. This work concentrates on the use of an FIB instrument …
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Ion beam enhanced grain growth in thin films
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1987.
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Laser spectroscopy of molecular ions in an ion beam
The operation of a coaxial ion beam/laser beam experimental apparatus is described, in which an ion beam is overlapped by a laser beam and the ions are Doppler-tuned into resonance. The experimental apparatus is suitable for the study of both positive and negative ions. Resonant transitions are …
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Engineering ionic liquid ion sources for ion beam applications
Ionic liquid ion sources (ILIS) are devices capable of producing positive and negative molecular ion beams through field evaporation from room-temperature molten salts. If sufficiently high hydraulic impedance from the liquid-supporting emitter is provided such that the ratio of flow rate Q to …
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