ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Articles  (110)
  • Maps
  • 82.65  (110)
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (110)
Collection
  • Articles  (110)
  • Maps
Source
Keywords
Publisher
Years
Topic
  • 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
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Sputtered neutral mass spectrometry (SNMS) as a tool for chemical surface analysis and depth profiling (1977)
    Springer
    Applied physics 14 (1977), S. 43-47 
    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 An experimental system for mass spectrometry of supttered neutral particles involving a hf plasma operated in Ar at several 10−4 Torr is described. The potentialities of the method for quantitative surface analysis are reasoned. Depth profiling by sputtered neutral mass spectrometry is demonstrated for anodic oxide layers on Nb and Ta.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00882632
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Isotope effects in electron impact desorption of CO and O2 adsorbed on the (110) plane of tungsten (1977)
    Springer
    Applied physics 14 (1977), S. 79-87 
    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 Results on the isotope effect for total and ionic desorption cross sections in the electron impact desorption of various binding states of CO on the (110) plane of tungsten, and of oxygen on this plane are presented and discussed. It is shown that the observations allow a dissection of cross sections into excitation cross sections and escape probabilities, and that the latter can be used to estimate lifetimes of excited or ionic states. It is found that excitation cross sections for total desorption are of the order of 10−16–10−17 cm2, but seem to be significantly smaller in some cases for excitation to ionic states, suggesting that different excitations are involved. In all cases examined here the isotope effect for total desorption is much smaller than for ion production. This can be explained by the fact that ion lifetimes are somewhat shorter than those of excited neutrals. Lifetimes are estimated, in the cases examined, to be of the order of 10−14s.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00882636
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Surface enhanced covalency and its effect on the surface states ofd-band metal oxides (1977)
    Springer
    Applied physics 13 (1977), S. 21-24 
    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 The effect of electron-electron interactions on the surface states of ionicd-band oxides is reported. The local density of states of surface cations in the valence band region is significantly increased when surface states occur in the band gap. Coulomb repulsion associated with thissurface enhanced covalency tends to force surface states out of the band gap. These results suggest an explanation of recent experiments on SrTiO3 and TiO2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00890714
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Combined RHEED-AES study of the thermal treatment of (001) GaAs surface prior to MBE growth (1979)
    Springer
    Applied physics 19 (1979), S. 63-70 
    Details
    ISSN: 1432-0630
    Keywords: 65 ; 82.65 ; 68.55
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Auger analysis and reflection high energy electron diffraction (RHEED) have been used to study the UHV thermal cleaning procedure of different chemically treated (001) GaAs surfaces when heated in ultra high vacuum. It is shown that the ultimate surface composition of the substrate critically depends on the nature and the thickness of the oxide layer formed during chemical treatment. The oxygen removal mechanism has been studied and a comparative analysis of AES and RHEED observations has been drawn. A low residual carbon coverage cleaning procedure is fully investigated and it results that a carbon coverage as low as ∼6×10−2 monolayer induces surface faceting by heating the GaAs substrate at temperatures higher than 570°C. A (001) GaAs surface heated in an arsenic flux up to 570°C is As-stabilized and (411) facets appear at a temperature ranged between 575 and 585°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00900540
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Some investigations of moderators for slow positron beams (1979)
    Springer
    Applied physics 19 (1979), S. 247-255 
    Details
    ISSN: 1432-0630
    Keywords: 78.70 ; 82.65 ; 79.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Measurements were made on a low-energy positron beam apparatus in an attempt to increase the efficiency of the slow positron yield from radioisotopes. A study was made to sweep thermalized positrons to the surface of a silicon wafer with an applied electric field at 298 and 140 K. Temperature studies were also made on more conventional Pt and Pt+MgO powder moderators and the results are discussed. The role of the MgO powder has been clarified, though fundamental questions remain. The positron apparatus beam and relevant information regarding sources, temperature and magnetic fields are discussed in sufficient detail so that such a slow positron beam utilizing a “conventional” slow positron moderator could be easily duplicated for use in solid state studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00900467
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    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
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Theoretical analysis of thermal desorption (1979)
    Springer
    Applied physics 19 (1979), S. 387-398 
    Details
    ISSN: 1432-0630
    Keywords: 34 ; 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 The physical causes of multiple peaks obversed in thermal desorption spectra are investigated using chemical rate equations and a two binding site model. An exclusion term is introduced which adds the repulsive adatom-adatom hard sphere interactions into the rate equations. Finally, using a fundamental statistical mechanical approach it is demonstrated how general adatom-adatom interactions can be incorporated into the expression for the surface delay time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00930102
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Desorption rates and mechanisms for dissociatively chemisorbed molecules (1979)
    Springer
    Applied physics 19 (1979), S. 413-420 
    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 The desorption kinetics of dissociatively chemisorbed diatomic molecules are examined from a kinetic-modeling point of view. A comparison is made between a one-step process, resulting in the usual second-order kinetics, and a two-step process which takes into account explicity recombination of atoms and subsequent desorption of molecules. The kinetics from the two-step mechanism are found to be equivalent to second-order desorption with a coverage-dependent activation energy which, in many cases, is a linear function of coverage. The two-step process leads to second-order kinetics with a constant activation energy only for special values of the model rate parameters, or if chemisorption is activated. The steady onate approximation for the intermediate in the two-step process is often adequate, but the transient period during which a steady state is reached also contains important kinetic information. The implications of these results for desorption kinetics and molecular beam reaction experiments are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00930105
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    On the mechanism of liquid metal electron and ion sources (1979)
    Springer
    Applied physics 19 (1979), S. 365-375 
    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 mechanisms of electron and ion generation from Taylor cones of liquid metals are discussed. In the case of electron emission the vacuum arcing mechanism of Swanson and Schwind, which accounts for the observed high current repetitive pulsing is briefly reviewed. For ion emission mechanisms from onset to the high current regime are proposed. It is concluded that at onset ions are generated exclusively by field desorption. A theory to account for the observed emitter heating is advanced, and it is concluded that high currents result from field ionization of thermally evaporated atoms. It is shown that space charge becomes important even at very low ion currents and'is instrumental in providing stabilization in all regimes of ion emission.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00930099
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...