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  • 42.65  (1)
  • 42.85Fe  (1)
  • solid state NMR spectroscopy  (1)
  • Springer  (3)
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  • Springer  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    The role of defects in laser surface damage thresholds of fluoride crystals (1989)
    Springer
    Applied physics 49 (1989), S. 199-204 
    Details
    ISSN: 1432-0630
    Keywords: 42.85Fe ; 61.80Ba ; 42.20Ji
    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 energy of the acoustic pulse generated by laser-surface interactions and measured by probe beam deflection was used to investigate laser surface damage thresholds of fluoride crystals with optical quality. It was found that damage thresholds decrease with increasing density of surface states. The defect density also controls the energy absorption mechanism: for surfaces with few defects, like polished MgF2 and CaF2, avalanche breakdown occurs at above 1 GW/cm2, whereas for materials with lower damage thresholds, such as LiF, BaF2, and roughened or incubated surfaces of CaF2, multiphoton absorption across the band gap is observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00616299
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  • 2
    Electronic Resource
    Electronic Resource
    Adsorption of oxygen and hydrogen on Pt(111) studied with second-harmonic generation (1995)
    Springer
    Applied physics 60 (1995), S. 209-215 
    Details
    ISSN: 1432-0630
    Keywords: 68.35 ; 82.20 ; 42.65
    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 adsorption of oxygen and hydrogen on a Pt(111) surface has been studied with phase-sensitive Second-Harmonic Generation (SHG) signal detection. The SHG-signal change measured with p-in, p-out polarization during the adsorption of oxygen and hydrogen was found to be different in amplitude and phase for the two adsorbates. At the wavelength used (1064 nm), only a localized interaction between adsorbate and substrate is seen, leading to a linear dependence of the susceptibility on the coverage. Sticking coefficients,sθ, and their coverage dependence were determined. For hydrogen, a linear decrease insθ with coverage was found; the initial sticking coefficient beings 0=0.06 at a temperature ofT=130 K. For oxygen,sθ whows a quadratic decrease with coverage, strongly dependent on temperature, withs 0=0.05 atT=350 K. A method based on these results is proposed, which would allow the determination of adsorbate coverages of coadsorption systems with SHG using phase-sensitive signal detection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01538248
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  • 3
    Electronic Resource
    Electronic Resource
    Characterisation of dissolving pulp using designed process variables, NIR and NMR spectroscopy, and multivariate data analysis (1999)
    Springer
    Cellulose 6 (1999), S. 233-249 
    Details
    ISSN: 1572-882X
    Keywords: dissolving pulp ; alkali resistance ; filterability ; NIR spectroscopy ; solid state NMR spectroscopy ; multivariate data analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Two processability variables, filter clogging and alkali resistance, were measured in a series of laboratory‐cooked viscose pulps. The pulps were also characterised by 13C‐CP/MAS solid state nuclear magnetic resonance (NMR) and near infrared (NIR) spectroscopy. Partial least squares (PLS) regression was used to investigate the information provided by the spectroscopic methods with respect to the processability measurements. The study showed that the alkali resistance, R18, of the pulp and the filter clogging value, Kw, of the laboratory‐prepared viscose can be modelled by NIR and multivariate data analysis (MVA). The alkali resistance, R18, of the pulp can also be calculated by NMR and partial least squares (PLS) regression. Analysis of the loading values in the PLS model showed that pulps with high alkali resistance have higher crystallinity than pulps with low alkali resistance. Analysis of variables of the cooking conditions showed that the chemical charge (Na2O) and pH should be kept low to give high alkali resistance, whereas high Na2O gives low filter clogging values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009273715004
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