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  • 1
    Electronic Resource
    Electronic Resource
    Ultraviolet photoelectron studies of the molecules Se5, Se6, Se7 and Se8 with relevance to their geometrical structure (1991)
    Springer
    The European physical journal 19 (1991), S. 229-231 
    Details
    ISSN: 1434-6079
    Keywords: 31.20. +Z ; 33.60.Cv ; 35.20.Vf ; 36.40. +d
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The vacuum-UV-photoelectron spectra (hν=10.0 eV) of Se2, Se5, Se6, Se7 and Se8 were measured. The isolated particles were examined in a supersonic molecular beam employing the photoelectron-photocation-coincidence technique. The structures of the photoelectron spectra of selenium molecules with even and odd numbers of atoms differ in a characteristic manner. Whereas the spectra of Se6 and Se8 show one single broad band, three separated bands with different intensities are observed for Se5 and two for Se7. An attempt to connect these experimental observations with the geometrical structure of the molecules shows that the photoelectron spectra are consistent with theC 1h -symmetry of the Se5 and Se7 rings proposed in the literature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01448299
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Electronic structure of selenium- and tellurium-clusters (1991)
    Springer
    The European physical journal 19 (1991), S. 233-235 
    Details
    ISSN: 1434-6079
    Keywords: 33.60.Cv ; 36.40. +d
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The vacuum-UV-photoelectron spectra (hν=10.0 eV or 8.3 eV) of selenium- and tellurium-clusters of different sizes (up to Se25 and Te8) were measured in a molecular beam by a photoion-photoelectron-coincidence experiment. Especially, the photoelectron spectra (4p-π-electrons) of the selenium-clusters converge with growing cluster size to the well known spectra of amorphous solid selenium by taking into account the dielectric constant of the bulk material. The experimental results indicate the first evidence that larger selenium aggregates are van der Waals clusters of the molecules Se5, Se6, Se7 and Se8 which are contained in the equilibrium vapour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01448300
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    Paper (German National Licenses)
    Fulltext
  • 3
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    AERODYNAMICS OF TRAJECTORY CONTROL FOR REENTRY AT ESCAPE SPEED (1961)
    In:  CASI
    Details
    Publication Date: 2006-10-26
    Description: Aerodynamics of trajectory control for reentry at escape speeds
    Keywords: AIRCRAFT
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Prospects for actively cooled hypersonic transports (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Feasibility assessment of hypersonic transports with actively cooled airframe structure, considering liquid hydrogen fuel use as coolant
    Keywords: AIRCRAFT
    Type: ; 353-366. (
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    New approaches to hypersonic aircraft (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Hypersonic airbreathers aerodynamic, structural and propulsive system interactions, discussing hydrogen fuel heat sink, airframe and engine cooling and airframe materials
    Keywords: AIRCRAFT
    Type: ICAS PAPER 70-16 , INTERNATIONAL COUNCIL OF THE AERONAUTICAL SCIENCES, CONGRESS, 7TH; Sep 14, 1970 - Sep 18, 1970; ROME; ITALY
    Format: text
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  • 6
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    Key technology for airbreathing hypersonic aircraft. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: This paper reviews recent progress in the key hypersonic technologies, which has been good despite a relatively low priority. Successful hypersonic research engine tests have been made. Active cooling system analyses have shown potential for weight savings, alleviation of structural design problems, and long airframe life. Maturing computerized flow field theories permit optimizing engine-airframe performance. Adequate progress in the future requires an expanded technology program emphasizing hydrogen usage. A hydrogen fueled hypersonic research airplane is essential, providing critical flight data and operational experience.
    Keywords: AIRCRAFT
    Type: AIAA PAPER 73-58 , Annual Meeting and Technical Display; Jan 08, 1973 - Jan 10, 1973; Washington, DC
    Format: text
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    NASA TECHNICAL REPORTS
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