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  • 1
    Electronic Resource
    Electronic Resource
    Reactions of transition-metal ions with methylsilanes in the gas phase. The formation and characteristics of strong transition metal-silylene bonds (1986)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 108 (1986), S. 5668-5675 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00279a002
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Elimination of Watermark on Extremely High-Doped Poly-Silicon Surfaces Using HF-Vapor Cleaning (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 134 (Nov. 2007), p. 27-30 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.134.27.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Novel Synthesis for Ultrafine Barium Titanate Powders Using Peptized Titania Nano-Sol (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advances in science and technology Vol. 45 (Oct. 2006), p. 254-259 
    Details
    ISSN: 1662-0356
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Natural Sciences in General , Technology
    Notes: We have investigated a novel synthesis for highly spherical and ultrafine barium titanate(BaTiO3) powders using a peptized titania (TiO2) nano-sol as a precursor. The obtained TiO2nano-sol had the size less than 10 nm, which could be easily converted to BaTiO3 under 100 ℃. Thesize of the resulting BaTiO3 powder could be controlled from 42 to 167 nm by lowering the solutionconcentration from 1.00 M to 0.15 M. BET analysis indicated that the as-prepared BaTiO3 powdershad some porosity which was increased with the particle size. It was also found that the as-preparedBaTiO3 with smaller size had higher tetragonality and less intra-granular pores after annealing
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.45.254.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Interactions of low energy reactive ions with surfaces. I. Dose and energy dependence of 3–300 eV C+, O+, and CO+ reactions with a Ni(111) surface (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 5882-5893 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Reactions of C+, O+, and CO+ ions with a clean Ni(111) surface are studied as a function of both kinetic energy (Ek) and ion dose for a range of chemically important energies (3–300 eV). An energy- and mass-selected, differentially pumped ion beam and ultrahigh vacuum spectrometer system which is designed to perform Ek dependence measurements of low-Ek ion–surface interactions is described. The Ni surface is exposed to low-Ek beams of these ions and concentrations of the resulting adspecies are monitored by Auger electron spectroscopy (AES) and x-ray and UV photoelectron spectroscopy (XPS and UPS). Reactions of C+ and O+ with Ni(111) yield nickel carbide (for monolayer doses) and oxide, respectively. These reactions are efficient at low Ek; reaction probabilities Pr =0.6–0.8 are observed for Ek 〈20 eV. Pr decreases slowly with increasing Ek until implantation of ions into the solid becomes significant. In the reaction of CO+ with Ni(111), the yield of molecular CO on the surface drops rapidly from 0.5 to below 0.1 in the range 3–10 eV. Collisional dissociation of CO+, which results in formation of surface NiC and NiO adspecies, increases with Ek and becomes the dominant process above 9 eV. Depth profile studies of the reacted surfaces indicate that implantation of C+ into subsurface Ni layers is more facile than implantation of O+ in the high energy portion of the range investigated. A Monte Carlo simulation of the atomic ion penetration into Ni has been carried out and the results are compared with experimental measurements. Reaction, desorption, and collision induced dissociation of the reactive ions and their reaction energetics are discussed in terms of qualitative potential energy diagrams in order to interpret the observed Ek dependence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454521
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  • 5
    Electronic Resource
    Electronic Resource
    Interactions of low energy reactive ions with surfaces. II. Reactions of C+, O+, and CO+ ions with nickel oxide, carbide, and carbonyl (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 5894-5901 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Reactions of 5–200 eV C+, O+, and CO+ ions with nickel oxide (NiO), nickel carbide (NiC), and chemisorbed CO on nickel (CO/Ni) have been studied in an ultrahigh vacuum environment using the surface spectroscopic techniques of XPS, UPS, and AES. These low kinetic energy (Ek ) ions react with both the substrate Ni atoms as well as with the O, C, and CO adspecies, the latter reactions resulting in adsorbate chemical sputtering or desorption. Reaction probabilities PR and adsorbate desorption yields Y are determined for several different combinations of reactants and products. The reactions C+ + NiO and O+ + NiC result in O and C desorption, respectively, along with concurrent carbide and oxide formation. The O and C desorption yields are near unity for Ek 〈20 eV. The oxide desorption yield decreases with increasing Ek. This Ek dependence is contrasted with physical sputtering of NiO by Ne+ in the same Ek region. Recombination of C and O, inducing CO desorption, is asserted as the mechanism for these reactions. The reaction O+ + NiCO results in efficient depletion of surface CO, the results being consistent with recombination of O and CO followed by CO2 desorption. A Monte Carlo simulation is performed to model the C+ + NiO reaction. The results indicate that depletion of surface oxide is dominated by a chemical desorption mechanism for Ek (approximately-less-than)20 eV and that the physical sputtering mechanism becomes increasingly more important as Ek increases until it dominates for Ek (approximately-greater-than)200 eV. The reactivity and mechanisms for reactive ion induced desorption are discussed and compared to thermal O2 and CO reactions with surfaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454522
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  • 6
    Electronic Resource
    Electronic Resource
    Interaction of low energy reactive ions with surfaces. III. Scattering of 30–200 eV Ne+, O+, C+, and CO+ from Ni(111) (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 5902-5913 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Time-of-flight (TOF) and energy distributions of 30–200 eV Ne+, O+, C+, and CO+ scattered from Ni(111) have been investigated using pulsed ion beam techniques and classical trajectory simulations. The experiments probe the interaction potentials and the applicability of the binary collision approximation in the low energy range. The experimental scattering energies are in good agreement with the energies predicted by the classical treatment. Scattering of atomic projectiles at primary energies as low as 30 eV (scattered energies ∼15 eV) has been detected and is characterized by sharp scattering peaks. The lower limit of detectability is determined by the sensitivity of the detector to slow neutrals. The reactive ions are completely neutralized in the scattering collision while some of the Ne+ ions survive single scattering events. Scattering of molecular CO+ produces a broad scattered flux distribution due to partial dissociation and scattering of both molecular and atomic species. Trajectory simulations have been performed using a purely repulsive Biersack–Ziegler potential and a Biersack–Ziegler potential combined with a Morse potential to include an attractive component. The importance of the attractive potential in describing the trajectories of the reactive ions increases with decreasing ion energy. This attractive potential is shown to be responsible for preferential neutralization of reactive ions by altering the trajectories so that the distance of closest approach is shorter and the time spent near the surface is longer, thus enhancing electronic interaction between colliding species. Energy level diagrams are used to discuss the neutralization transitions and the differences between the reactive and noble ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454523
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  • 7
    Electronic Resource
    Electronic Resource
    Chemical sputtering of nickel oxide and carbide by low energy (5–200 eV) C+ and O+ beams (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 3753-3755 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Recombination of carbon and oxygen on a Ni(111) surface has been studied by low energy (5–200 eV) reactive ion bombardment (RIB). The reactions O++NiC(s) and C++NiO(s) both result in efficient removal of the surface carbon and oxygen, respectively. Removal of the adspecies occurs most efficiently at low kinetic energies and the rate of sputtering decreases with increasing kinetic energy. Energy dissipation into the solid appears to be insufficient for stabilization of the molecular CO product as a surface adsorbate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.451978
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  • 8
    Electronic Resource
    Electronic Resource
    Interactions of low energy reactive ions with surfaces. IV. Chemically bonded diamond-like films from ion-beam deposition (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 5914-5924 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Low energy (10–300 eV) mass-selected C+ ion beams are used to deposit thin carbon films on surfaces of Si(100), Ni(111), Ta, W, and Au in a UHV environment at room temperature. The films are characterized by Auger electron spectroscopy (AES), x-ray and UV photoelectron spectroscopy (XPS and UPS), valence level electron energy loss spectroscopy (ELS), K-shell ionization loss spectroscopy (ILS), and ellipsometry. The initial monolayer of the deposited film is in the form of a carbide layer which is chemically bonded to the substrate atoms. The film evolves gradually over the next several layers deposited, through intermediate structures, into a diamond-like structure. The diamond-like structure is confirmed by comparing the results of the above spectroscopic measurements with those of pure diamond and graphite and by referring to band structure calculations. A phase diagram, prepared as C+ ion dose vs C+ kinetic energy Ek, shows the regions of the different structures. The optimum C+ energy range for formation of the diamond-like structure is 30–175 eV. Below 10 eV the final diamond-like structure has not been attained and above 180 eV there is a sharp increase in the dose required to attain this final structure. The films are found to be free of impurities, inert to O2 chemisorption, structurally stable up to 350 °C, have a low sputtering yield, and have a sharp interface with the substrate surface. The mechanism of film deposition and growth is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454524
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  • 9
    Electronic Resource
    Electronic Resource
    Ionic-to-metallic layer transition in Cs adsorption on Si(111)-(7×7): Charge-state selective detection of the adsorbates by Cs+ reactive ion scattering (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 112 (2000), S. 8660-8664 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We examined the adsorption of Cs on a Si(111)-(7×7) surface by reactive ion scattering (RIS) of hyperthermal Cs+ beams. The RIS from a Cs-adsorbed surface gives rise to Cs2+, representing pickup of a surface Cs by a Cs+ projectile. The Cs2+ intensity is proportional to the surface coverage of Cs at a high substrate temperature (473 K), while it varies anomalously with the coverage at low temperatures (130–170 K). This observation indicates that RIS selectively detects metallic Cs on the surface, but discriminates ionic Cs. The transition from an ionic to metallic Cs adlayer is driven by the thermal diffusion of Cs and their clustering process. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.481467
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  • 10
    Electronic Resource
    Electronic Resource
    Pulsed laser evaporation and ionization of solid metal targets. Implications for studying the gas-phase reactions of laser-generated atoms and ions (1985)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 89 (1985), S. 3364-3367 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100261a041
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