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Showing 1 to 20 of 110 for “"UHV"”.
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Využití interferometrie v VT UHV SPM
Disertační práce je zaměřena na vývoj rastrovacích sondových mikroskopů. Popisuje ná- vrh a vývoj modulární řídicí elektroniky, aby mohla být využita u více mikroskopů SPM. Řídicí elektronika se sestává ze stabilizovaného zdroje napětí, vysokonapěťového zesilo- vače a zesilovače signálu sondy. Byl …
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Computer relaying for EHV/UHV transmission lines
… the pilot relay algorithms work well for EHV IUHV transmission lines including the series compensated lines. The fault location based distance relay works well in most cases, but it may give a wrong decision for the close-in fault with the fault resistance and may have a singularity problem. …
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UHV-Studien zur oberflächenverstärkten Infrarotabsorption auf rauen Kupferfilmen
Im Rahmen dieser Arbeit wurden Untersuchungen zum Effekt der oberflächenverstärkten Infrarotabsorption (SEIRA) auf unterschiedlichen Kupferoberflächen im Ultrahochvakuum durchgeführt. Dazu wurden Adsorbate auf ultradünnen Kupferfilmen von wenigen Nanometern Dicke sowie auf einem Cu(111)-Einkristall …
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Capillary absorption as an audible noise reduction scheme for UHV transmission lines.
Thesis. 1975. Ph.D.--Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science.
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NO-Adsorption und laserinduzierte Adsorbatplatzänderungen an Platin-Nanopartikeln und Aufbau einer STM-UHV-Kammer
Diese Dissertation widmet sich der Messtechnik und dem Adsorptionsverhalten von Stickstoffmonoxid an nanostrukturierten Platinoberflächen. Im technischen Teil wird der Aufbau und das Konstruktionskonzept eines Ultra-Hochvakuummessplatzes erläutert mit einigen Details, der Vorgehensweise beim Aufbau …
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Application of scanning micro-tip and UHV Kelvin probes in surface and material characterisation.
… due to environmental influences in ambient and UHV conditions. The SKP is a truly non-contact technique which determines local work function changes and surface states on conductors, semiconductors and even insulators. It measures the contact potential difference of a sample relative to the tip. …
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Investigation of surface structures at catalytically important metals by UHV - electron spectroscopic and electrochemical methods
… electrolyte. The measurements were made in a UHV (ultra high vacuum) - electrochemistry transfer system which allowed rapid contamination free UHV - electrolyte - UHV transfers. In UHV, low energy electron diffraction and Auger electron spectroscopic measurements were made and electrochemical …
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Structural Characterization of Thin Films of Molecules on Solid Surfaces: Development of a Portable UHV Chamber to Bridge RHEED and SFG Spectroscopy Techniques
In surface science, it is often essential to visualize and obtain the structures of molecules at solid-liquid and solid-vacuum interfaces, etc. Each surface characterization method has its advantages and disadvantages, and there is no single technique that can provide all possible information about …
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Scanning Tunneling Microscopy and Spectroscopy of Carbon Nanotubes Interfaced With Silicon Surfaces
… ultrahigh vacuum scanning tunneling microscope (UHV-STM) is used to examine SWNTs directly interfaced with the hydrogen-passivated Si(100) surface. An approach termed dry contact transfer (DCT) was developed for the UHV deposition of SWNTs with minimal disruption of the atomically flat …
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Synthesis and Characterization of Branched and Hyperbranched Polyetherimides and Selective Chemistry on the Nanolithographically Defined Silicon(100) Surface
… Si(100)-2 x 1 surface in ultrahigh vacuum (UHV) to expose nanometer sized, highly reactive ""templates"" of clean Si(100). The inherent reactivity differences between the clean and hydrogen terminated surface allow for the selective reaction of organic olefins such as norbornadiene and metal …
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Wärmeübertrag in der Ultra-Hochvakuum-Rasterwärmespektroskopie
… eines Ultra-Hochvakuum-Rastertunnelmikroskops (UHV-RTM) aufgebaut und einen geeigneten und einfach herstellbaren Temperatursensor entwickelt. Ziel der Arbeit war die Untersuchung des Mechanismus des Wärmeübertrags zwischen Probe und Sensor bei sehr kleinen Abständen. Ich konnte zeigen, daß unter …
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Measuring and Improving Copper-Polyimide Adhesion
… polyimide. The copper clusters are formed under UHV conditions by using mono-layer per minute deposition rates to assist equilibrium cluster formation. Values of the strength of adhesion from these contact angle measurements are in reasonable agreement with predictions made using Fowkes' theory …
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Optische Charakterisierung von II-VI-Halbleiter-Oberflächen in Kombination mit First-Principles-Rechnungen
… wurde eine eigens für diesen Zweck entwickelte UHV-Optikkammer benutzt. Diese einzigartige Möglichkeit, II-VI Halbleiterproben aus einer state-of-the-art MBE-Anlage mit einer UHV-Optikanlage zu kombinieren hat gezeigt, dass optische Spektroskopie sehr gut dafür geeignet ist, strukturelle …
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Strain-balanced silicon-germanium materials for near IR photodetection in silicon-based optical interconnects
… and ultra high vacuum chemical vapor deposition (UHV-CVD) is presented and the role of adsorbed hydrogen during UHV-CVD growth is addressed. Hydrogen adsorption 0,1 the growth surface proved a useful technique to minimize coherent strain relaxation at the higher growth temperatures required for …
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Interface Structure Studies of Copper Thin Films on C-Plane Sapphire by Crystal Truncation Rod Analysis Using Synchrotron X-Ray
Thin films were grown by UHV-MBE technique. The substrates underwent two different heat treatments prior to Cu deposition. One substrate was annealed in air at $1500\sp\circ$C for 3 hours followed by an anneal in UHV at $1200\sp\circ$C for 30 minutes prior to Cu deposition. The other substrate was …
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Scanning tunneling microscopy and spectroscopy of wet chemically synthesized porous graphene nanoribbons on hydrogen passivated silicon (100)
… transfer (DCT) method under ultrahigh-vacuum (UHV) conditions. The porous GNRs are characterized in UHV using scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS). A unique electronic feature is observed at the pore sites in the STM topographic images. STS measurements …
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Scanning tunneling microscopy and spectroscopy of graphene on semiconducting surfaces
… semiconducting substrates in ultrahigh vacuum (UHV). The Si(100) – 2×1:H, GaAs(110), InAs(110), and Si(111) – 7×7 surfaces used in this study were prepared in the UHV-STM chamber. We deposited monolayer and bilayer graphene features on the surfaces through a dry contact transfer (DCT) technique …
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Squeezed states for advanced gravitational wave detectors
… of experiments that lead to a ultra-high vacuum (UHV) compatible, low phase noise, and frequency-dependent squeezed vacuum source required for Advanced LIGO and future gravitational-wave detectors. In order to develop the required technology, two proof-of-principal experiments were conducted. In …
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Ultrahigh vacuum studies of the boundary lubrication of metals
A novel ultrahigh vacuum (UHV) tribometer was used to study the tribological behavior of two Cu(111) surfaces modified by the adsorption of various atomic (sulfur, chlorine, iodine) and molecular (ethanol, trifluoroethanol, butanol, and heptafluorobutanol) species as a function of coverage. The …
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Integration of Single -Walled Carbon Nanotubes With Gallium Arsenide(110) and Indium Arsenide(110) Surfaces: A Scanning Tunneling Microscopy Study
… and InAs(110) substrates in ultrahigh vacuum (UHV). Both flat and stepped III-V(110) surfaces were obtained through in situ cleavage and nanotubes subsequently deposited onto the substrates via an UHV-compatible dry contact transfer procedure. STM images indicate that SWNTs on these III-V(110) …
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