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  • Articles  (110)
  • 82.65  (110)
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (110)
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  • Articles  (110)
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  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (110)
  • Physics  (133)
  • 1
    Electronic Resource
    Electronic Resource
    Effect of Cu adsorption on the tungsten (100) surface resonance (1977)
    Springer
    Applied physics 13 (1977), S. 303-305 
    Details
    ISSN: 1432-0630
    Keywords: 82.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract It has recently been observed that adsorbed Au and Hg do not quench the W (100) surface resonance up to monolayer coverage. We report here that Cu does quench the W (100) surface resonance at θ≧0.5 monolayers. This suggests that the effective potential of Cu differs more strongly from that of W than do the effective potentials of Au or Hg.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00882897
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  • 2
    Electronic Resource
    Electronic Resource
    Energy accommodation and reactivity of O2 on tungsten (1977)
    Springer
    Applied physics 14 (1977), S. 141-147 
    Details
    ISSN: 1432-0630
    Keywords: 82.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract We have determined by direct molecular beam velocity measurements that translational energy accommodation of O2 molecules scattered from a hot polycrystalline tungsten target is inefficient at high surface temperatures. Translational energy accommodation is inefficient whether the surface is clean or covered with oxygen to a varying extent, even though in the latter case the scattering is diffuse. On a clean tungsten surface the scattering of the O2 was approximately specular and the reaction probability of O2 was constant and greater than 90% over the temperature range 1000K to 2800 K. It was shown by simultaneous helium scattering that atomic surface roughness of an oxygen chemilayer, rather than trapping, is a major cause of the observed diffuse scattering of oxygen. At the lowest surface temperature of 1000 K, with an oxygen chemilayer present, the velocity of the most probable number density of the scattered O2 was lower than in the incoming beam or than that expected for complete equilibration with the surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00883081
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  • 3
    Electronic Resource
    Electronic Resource
    Mechanism and speed of initial step of oxygen chemisorption-O2 on W (1977)
    Springer
    Applied physics 14 (1977), S. 411-413 
    Details
    ISSN: 1432-0630
    Keywords: 82.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A direct first step in the mechanism for the initial oxidation of a polycrystalline tungsten surface, the catalyzed dissociation of O2 on it, or the formation of WO X by O2 at intermediate temperatures is shown to occur in ∼10−13 s. Molecular beam experiments demonstrated that the reactivity was greater than 90%, the unreacted O2 was substantially unaccommodated in translational energy to the surface temperature, and the reaction probability was nearly independent of surface temperature from 2800 to 415 K although there was a small increase at 415 K. The general conditions when no molecular surface precursor state contributes to the surface reactivity are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00883448
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  • 4
    Electronic Resource
    Electronic Resource
    SIMS and flash desorption studies of nickel oxygen interaction (1978)
    Springer
    Applied physics 16 (1978), S. 367-373 
    Details
    ISSN: 1432-0630
    Keywords: 79.20 ; 82.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract O2 exposure of polycrystalline nickel at 300 K results in characteristics changes of secondary ion emission. These can be described by a model which is in good agreement with corresponding LEED, AES, XPS, and ΔΦ results of other authors. According to this model, oxygen can be bonded on Ni in at least five different phases: 1) chemisorption, indicated by a rapid increase of Ni+, Ni 2 + , and Ni2O+ (≦5 L); 2) a rearranged chemisorption layer, characterized by a drastic decrease of Ni+, Ni 2 + , and Ni2O+ (5–15 L); 3) nickel oxide (NiO) responsible for a strong NiO−- and NiO 2 − -emission (≦40 L); 4) oxygen on top of this NiO layer, producing a final increase of Ni+ and NiO+ and a O2-flash signal at 400 K (〉40 L); 5) bulk dissolved oxygen in thermal equilibrium with a chemisorption layer (after several exposure/heating cycles). During ion bombardment of a 100 L O2 exposed Ni surface these different binding states occur in a reversed order of succession. O2-flash signals at 400 and 1100 K, related to drastic changes in secondary ion emission at 400, 700, and 1100 K, reflect the disappearance of various oxygen binding states. The exchange between different oxygen phases was studied by16O2/18O2 isotope experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00885861
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  • 5
    Electronic Resource
    Electronic Resource
    Water formation on oxygen exposure of some hydrides of intermetallic compounds (1980)
    Springer
    Applied physics 22 (1980), S. 303-306 
    Details
    ISSN: 1432-0630
    Keywords: 82.65 ; 81
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract It is found that a large number of metal hydrides such as hydrides of materials in Ca−Mg−Ni can form water when exposed to O2 largely without signs for concomitant substrate oxidation. One can speak of a catalytic reaction in this connection as the H-depleted metal matrix can in most cases be rehydrided and water synthesis repeated on exposure to O2. In some cases a considerable portion of the H combustion reaction takes place in a matter of seconds. Some of the metal hydrides such as hydrides of CaNi4B, CeNi3, and YbNi2, are relatively stable concerning decomposition of the alloy by the product water, while others, for example hydrides of CaNi3, and CaNi2, are rapidly decomposed by the product water forming the hydroxide of the electropositive metal. They also produce fine ferromagnetic Ni-particles which could be interesting for other catalytic purposes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00899882
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  • 6
    Electronic Resource
    Electronic Resource
    Comment on “On the mechanism of liquid metal electron and ion sources” (1980)
    Springer
    Applied physics 23 (1980), S. 193-194 
    Details
    ISSN: 1432-0630
    Keywords: 82.65 ; 79.40 ; 68.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The electric field near the anode of an electrohydrodynamic ion source is analytically discussed. For the field at the anode apex a rigorous analytical treatment results in the simple expressionE 0 ≅V AC/(P0R0)1/2 differing by a factor of 1/2/32 from that by Gomer. Here,V AC is the applied potential to the cathode with regard to the anode,R 0 the cathode distance from the anode center, andP 0 the radius of curvature at the apex of the anode surface. The analytical forms for the radius of curvature and the electric field direction as well as the electric field itself at arbitrary points on the anode are derived.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00899717
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  • 7
    Electronic Resource
    Electronic Resource
    Possibility of enhancement of slow positron emission (1985)
    Springer
    Applied physics 36 (1985), S. 47-49 
    Details
    ISSN: 1432-0630
    Keywords: 78.70 ; 82.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A possibility to apply directional action of a metal-metal junction on positron diffusion motion has been shown to increase the slow positron reemission from a metallic moderator.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00616460
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  • 8
    Electronic Resource
    Electronic Resource
    Growth of molybdenum carbide particles from an amorphous phase induced by ion bombardment (1985)
    Springer
    Applied physics 38 (1985), S. 275-279 
    Details
    ISSN: 1432-0630
    Keywords: 68.55 ; 82.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Transmission electron microscopy and Auger electron spectroscopy revealed that the Ar+-ion bombardment of a carbon-containing molybdenum film with an amorphous structure led to the growth of carbide particles smaller than ∼30nm in diameter. The particles possessed an fcc structure and were distributed like islands in the film. Electron diffraction analysis identified them withβ-MoC0.75, a high-temperature phase of MoC0.75. Presumably, the heating effect of the ion beam was responsible for forming and stabilizing the particles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00616063
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  • 9
    Electronic Resource
    Electronic Resource
    Basic mechanisms in laser etching and deposition (1986)
    Springer
    Applied physics 41 (1986), S. 315-330 
    Details
    ISSN: 1432-0630
    Keywords: 81.40 ; 82.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Laser-induced chemical processing of solid surfaces has the potential for being an important and powerful technique for fabrication of a variety of devices. Successful applications rest on a detailed understanding of the nature of laser-induced reactions and their effects on the properties of materials. In this paper fundamental studies illustrating key features of laser etching and deposition are reviewed. Topics covered include the effect of the choice of precursor and deposition conditions on film composition and morphology, self-propagation of exothermic reactions, thermal and electronic effects in laser-assisted etching of semiconductors, metals and polymers, and special aspects of laser-surface photophysics as they may affect chemical reactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00616055
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  • 10
    Electronic Resource
    Electronic Resource
    Application of molecular (static) secondary ion mass spectroscopy to detection of organic molecules in amorphous titanium carbide (1987)
    Springer
    Applied physics 42 (1987), S. 139-143 
    Details
    ISSN: 1432-0630
    Keywords: 82.80 ; 82.65 ; 81.10
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Molecular, or static, secondary ion mass Spectroscopy (SIMS) is applied to the detection of organic molecules in amorphous titanium carbide films. The presence of such organic clusters is thought to stabilize the amorphous phase to higher temperatures (〉1000°C) and greater thicknesses. The high corrosion resistance properties of the TiC deposits are also attributed to the inclusion of such molecular entities. The processes whereby these molecular entities in the films are transformed into secondary ions during SIMS analysis are also investigated. It is shown that the dominant ionization mechanisms in this case are electron and momentum transfer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00616724
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