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  • 1
    Electronic Resource
    Electronic Resource
    Depth profiling of copper thin films by resonant laser ablation (1995)
    Springer
    Applied physics 61 (1995), S. 221-225 
    Details
    ISSN: 1432-0630
    Keywords: 78.65 ; 07.75 ; 81.60 ; 82.80
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract In Resonant Laser Ablation (RLA), material is related and selectively ionized by a low-energy pulse from a tunable laser. The selectivity and efficiency allow detection and quantitation at very low concentrations. We demonstrate that RLA has potential use in profiling thin layer and multilayer structures. Quantitative results are reported on the analysis of 20 and 100 Å copper thin films on Si(110) surfaces. Removal rates range from 10−3 to 10−2 Å/shot. Prospects for interrogation of dopants and impurities are also evaluated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01538394
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Unknown
    Space storable propellant acquisition system (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Surface tension propellant acquisition concepts for an advanced spacecraft propulsion system having a 10-year mission capability were investigated. Surface tension systems were specified because they were shown to be the best propellant acquisition technique for various interplanetery spacecraft in a prior study. A variety of surface tension concepts for accomplishing propellant acquisition were formulated for the baseline space storable propulsion module and Jupiter Orbiter mission. Analyses and evaluations were then conducted on each candidate concept to assess fabricability, performance capability, and spacecraft compatibility. A comparative evaluation of the results showed the Fruhof-class of low-g surface tension systems to be preferred for these interplanetary applications.
    Keywords: SPACE VEHICLES
    Type: NASA-CR-114493
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    A feasibility study of developing toroidal tanks for a spinning spacecraft (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A study was made to determine the feasibility of developing toroidal propellant tanks for a bipropellant (N204/MMH) propulsion system to be used in a proposed advanced Pioneer spin-stabilized vehicle intended for a Jupiter-orbiter and possibly a Saturn-orbiter mission. The rationale for considering the use of two toroidal tanks rather than the proposed use of four spherical tanks includes the belief that a more symmetrical distribution of propellant mass and a smaller variation in the position of the vehicle center-of-mass during propellant consumption would result, reducing requirements for attitude-control propellants, for balance weight, and for other weights associated with the dynamics of the spinning spacecraft. Results lead to the conclusion that a toroidal tank containing an effective, passive surface tension propellant acquisition device could be fabricated with available manufacturing methods and could be used interchangeably for either fuel or oxidizer.
    Keywords: SPACE VEHICLES
    Type: NASA-CR-114666 , MCR-73-223
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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