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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 20 of 66 for “"atomic hydrogen"”.
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Bose-Einstein condensation of atomic hydrogen
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Physics, 1999.
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Etching of Gallium Arsenide with atomic hydrogen
… exposure to a known concentration of thermalised hydrogen atoms downstream from an H₂ plasma. Etch rates between 3 and 9 nm/min are followed at constant temperature within the range 229 - 360 °C. Increasing substrate temperature leads to increased rates of reaction. A Pt wire is used as an …
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Two-photon spectroscopy of trapped atomic hydrogen
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1996.
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Research toward laser spectroscopy of trapped atomic hydrogen
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1993.
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High precision millimeter-wave spectroscopy of atomic hydrogen
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1992.
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Electron impact excitation of 2p states in atomic hydrogen
… coherence in the excitation of the 2p states of atomic hydrogen through a collision with an unpolarised electron. The polarisation correlation variation of the delayed coincidence method has been employed to simultaneously measure the reduced Stokes parameters P1,P2 and P3, which are needed to …
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Path-integral simulations of solid and liquid atomic hydrogen
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2026-05-01
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A study of a cold atomic hydrogen beam source
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Physics, 1990.
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Surface cleaning of optics by plasma (scope) with atomic hydrogen
A major obstacle in the implementation of extreme ultraviolet (EUV) light photolithography in production tools is the accumulation of fuel debris on the collector optics near the pinch region. Specifically, removal of deposited tin from the source onto the collector optics is needed to improve the …
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Formation and decay of a Bose-Einstein condensate in atomic hydrogen
… and decay of a Bose-Einstein condensate (BEC) in atomic hydrogen is studied. Magnetically trapped hydrogen atoms were evaporatively cooled close to the onset of Bose-Einstein condensation and then suddenly quenched below the transition temperature. The subsequent condensate formation and decay …
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Photoionization of excited states of atomic hydrogen in a strong electric field
The photoionization of excited states of atomic hydrogen in a strong external electric field is examined theoretically and experimentally. A theoretical treatment which predicts novel effects in the excitation of the broad resonant states in the continuum from pure parabolic Stark states is …
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Ultracold surface collisions : sticking probability of atomic hydrogen on a superfluid 4He
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1993.
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Optical and transport studies of atomic hydrogen and chalcogen impurities in alkali metals
Atomic hydrogen and chalcogen (0 and Te) impurities in alkali metal thin films have been studied. Their optical properties were determined by transmission measurements in the vacuum ultraviolet and transport properties were probed by means of electrical resistance. The observed optical absorption …
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The Impact of Atomic Hydrogen on the Properties of the Silicon/Silicon Dioxide Interface
In this thesis, the influence of atomic hydrogen on the surface passivation of Si and SiO2 interface was mainly investigated. The effect of corona charging, humidity, UV exposure and mineral acid on Si and SiO2 interface was compared to the effect of atomic hydrogen. The electrical properties of …
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The Impact of Atomic Hydrogen on the Properties of the Silicon/Silicon Dioxide Interface
In this thesis, the influence of atomic hydrogen on the surface passivation of Si and SiO2 interface was mainly investigated. The effect of corona charging, humidity, UV exposure and mineral acid on Si and SiO2 interface was compared to the effect of atomic hydrogen. The electrical properties of …
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Energy distribution measurements of magnetically trapped spin polarized atomic hydrogen : evaporative cooling and surface sticking
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1991.
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Negative ion charge transfer of the reaction of S⁻ and O⁻ with atomic hydrogen producing H⁻ ions from 1500 to 10 kev
… reactions of 0<sup>-</sup>, S<sup>-</sup> with atomic hydrogen were studied from 1.5 to 10 KeV, and the reaction Cl<sup>-</sup> + O<sub>2</sub> + O<sub>2</sub><sup>-</sup> + Cl was studied from 10 eV to 10 KeV. The reactions studied were normalized to the reaction H<sup>-</sup> + H + H + …
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On the reduction of metal oxides in non-equilibrium hydrogen plasmas
… improved processes for reducing metal oxides. Atomic hydrogen, consisting of dissociated hydrogen radicals, has the potential to be such a reagent: due to its high chemical potential, atomic hydrogen is naïvely predicted to be able to reduce even the most stable metal oxides. Additionally, the …
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Scanning Tunneling Microscopy of Homo-Epitaxial Chemical Vapor Deposited Diamond (100) Films
Atomic resolution images of hot-tungsten filament chemical-vapor-deposition (CVD) grown epitaxial diamond (100) films obtained in ultrahigh vacuum (UHV) with a scanning tunneling microscope (STM) are reported. A (2x1) dimer surface reconstruction and amorphous atomic regions were observed on the …
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