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Showing 1 to 20 of 60 for “"ultrahigh vacuum"”.
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Surface Enhanced Raman Scattering Studies in Ultrahigh Vacuum
… section. These studies were performed in an ultrahigh vacuum chamber. This enhancement is similar to that observed off silver electrodes in electrochemical cells. The enhancement is destroyed by room temperature annealing of our films, so we infer that the surface roughness inherent in our …
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Surface Studies in Ultrahigh Vacuum by Radiotracer Techniques
Made available in DSpace on 2015-05-12T17:12:22Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 6101614.PDF: 2567226 bytes, checksum: 4e0acb26576b35847fc12380740caa9b (MD5) Previous issue date: 1961
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Surface enhanced Ramam scattering studies in ultrahigh vacuum
… section. These studies were performed in an ultrahigh vacuum chamber. This enhancement is similar to that observed off silver electroue5 in electrochemical cells. The enhancement is destroyed by room temperature annealing of bur films, so we infer that the surface roughness inherent in our …
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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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Alcohol surface chemistry in ultrahigh vacuum and at high pressure
As models for the boundary layer films formed on lubricated metal surfaces, the surface chemistry of a set of straight chain alcohols on the clean and pre-oxidized Ag(110) surfaces have been examined. On the clean Ag(110) surface, the alcohols from methanol to pentanol were found to adsorb …
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Adsorption of Anions on Platinum and Rhodium Single-Crystal Electrodes: Ultrahigh Vacuum Approach
This thesis presents results of ex situ ultrahigh vacuum (UHV) studies of adsorption of reversibly adsorbing anions and anion-like urea molecule on platinum and rhodium single crystal electrodes. It reports on the composition and structure of bisulfate and urea on Pt(111) and Pt(100) surfaces and …
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Metal Oxide Reactions in Complex Environments: High Electric Fields and Pressures above Ultrahigh Vacuum
Metal oxide reactions at metal oxide surfaces or at metal-metal oxide interfaces are of exceptional significance in areas such as catalysis, micro- and nanoelectronics, chemical sensors, and catalysis. Such reactions are frequently complicated by the presence of high electric fields and/or …
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Ultrahigh Vacuum Studies of the Kinetics and Reaction Mechanisms of Ozone with Surface-Bound Fullerenes
… of ozone with carbonaceous nanomaterials. Recent ultrahigh vacuum studies of the reaction of gasphase ozone with surface-bound fullerenes have made it possible to observe the formation and subsequent thermal decomposition of the primary ozonide (PO). As the use of nanomaterials, such as C₆₀, …
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Low-temperature growth of silicon and silicon-germanium alloy by ultrahigh vacuum ion-beam sputter deposition
The use of energetic (average energy $\simeq$ 18 eV), rather than thermal, Si beams increased Si(001) epitaxial thicknesses t$\rm\sb{e}$ by up to an order of magnitude over the growth temperature range $\rm T\sb{s}=80{-}300\sp\circ$C yielding t$\rm\sb{e}$ = 10 nm-1.2 $\mu$m at a growth rate R = 0.1 …
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Ultrahigh Vacuum Studies of the Reaction Mechanisms of Ozone with Saturated and Unsaturated Self-Assembled Monolayers
… gases with ozone or surface products, an ultrahigh vacuum surface analysis instrument was designed and constructed to explore the reactions of ozone with the atmospheric model systems. The surface reactions can be monitored in real-time with reflection absorption infrared spectroscopy …
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Ultrahigh Vacuum Studies of the Reaction Kinetics and Mechanisms of Nitrate Radical with Model Organic Surfaces
Detailed understanding of the kinetics and mechanisms of heterogeneous reactions between gas-phase nitrate radicals, a key nighttime atmospheric oxidant, and organic particles will enable scientists to predict the fate and lifetime of the particles in the atmosphere. In an effort to acquire …
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Ultrahigh Vacuum Studies of the Fundamental Interactions of Chemical Warfare Agents and Their Simulants with Amorphous Silica
… nerve and blister agents, were performed in ultrahigh vacuum to provide a well-characterized system in the absence of background gases. Transmission infrared spectroscopy and temperature-programmed desorption techniques were used to learn about the adsorption mechanism and to measure the …
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The partial oxidation of propene to acrolein over single-crystal Cu₂O
… crystal surfaces. Propene adsorption under ultrahigh vacuum conditions yields no significant oxidation products, but the propene desorption temperatures are sensitive to the structural differences in the surfaces. Propene adsorption at atmospheric pressure followed by thermal desorption in …
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Preparation and characterization of in situ deposited metal-insulator-III-V semiconductor devices
… integrates several MBE growth chambers with an ultrahigh vacuum chemical vapor deposition chamber was designed and built. All of the chambers in this growth system are connected by vacuum transfer tubes and sample transfer takes place under ultrahigh vacuum conditions. The technique of electron …
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An electrochemical and surface analytical investigation of iron oxidation, passivation and corrosion inhibition
… corrosion inhibitor interaction is presented. Ultrahigh vacuum surface analysis by Auger electron spectroscopy (AES), low energy electron diffraction (LEED), thermal desorption mass spectrometry (TDMS) and ion bombardment (depth profiling) was used to investigate iron oxide films formed on iron …
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Synthesis and Characterization of Branched and Hyperbranched Polyetherimides and Selective Chemistry on the Nanolithographically Defined Silicon(100) Surface
… the hydrogen-terminated 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 …
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Scanning tunneling microscopy and spectroscopy of wet chemically synthesized porous graphene nanoribbons on hydrogen passivated silicon (100)
… using a dry contact 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. …
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Quantum simulations with 8̳8̳Sr+̳ ions on planar lattice traps
… a hexagonal lattice trap and install it into an ultrahigh vacuum chamber. This thesis also presents the construction of the experimental test apparatus for the trapped ion quantum simulator, including the electronics, optics, and vacuum systems.
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Atomic-Scale Characterization of Nanometer-Sized Graphene
… electronic properties of the graphene using the ultrahigh-vacuum scanning tunneling microscope (UHV-STM). By using tunneling spectroscopy, we measure a size-dependent energy gap for graphene quantum dots (QDs) (aspect ratio ≈1) and determine the energy gap (Eg)---size ( L) relation. Our Eg …
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The Direct Dissociation of Methanol on V(100) Surfaces
… chemicals. The construction of a custom-designed ultrahigh vacuum chamber was done to permit surface analysis to a greater extent than was previously available in the lab. Prior to experimentation, the clean vanadium surface was characterized through use of X-ray photoelectron spectroscopy, …
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