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  • Articles: DFG German National Licenses  (7)
  • 1990-1994  (7)
  • 1
    Electronic Resource
    Electronic Resource
    Near-critical light scattering of an ionic fluid with liquid–liquid phase transition (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 848-851 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We report on the first static and dynamic light scattering measurements of near-critical behavior of an ionic fluid. The model system tetra-n-butylammonium picrate-tridecanol exhibits a liquid–liquid phase transition with an upper critical point near 342 K. The correlation lengths and scattering intensities scale with temperature corresponding to mean-field behavior. The data are also concordant with nonclassical 3D-Ising exponents if suitable Wegner corrections are applied. The spherical model recently suggested to apply for ionic fluids can be ruled out, thus resolving a current controversy in the literature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462416
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Numerical bifurcation study of a nonlinear current sheet model (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 1 (1994), S. 213-215 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Results are presented of a numerical investigation of the strongly nonlinear bifurcation properties of an isothermal current sheet model which has previously been investigated in the weakly nonlinear regime by analytical methods. With the method used, the linear stability of the bifurcating branch is also checked. The results have applications in the stability of plasma systems with current sheets, e.g., the Earth's magnetotail or solar coronal arcades.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.870554
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Ion beam assisted deposition with a duoplasmatron (abstract)a) : Proceedings of the fourth International Conference on Ion Sources (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 2393-2393 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: One of the recent applications of ion sources is their use for ion beam assisted deposition of thin films and coatings. This method combines a coating technique such as evaporation or sputtering with bombardment with ions in the keV energy range. The required ions with defined energy, flux, and impact angle are delivered from an ion source. An apparatus for ion beam assisted evaporation with a duoplasmatron ion source is described. The features of the duoplasmatron with respect to application for ion beam assisted deposition such as beam shape, uniformity and intensity, ion-to-neutral ratio, and focused and defocused mode are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142938
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Ion beam assisted deposition with a duoplasmatrona) (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 3058-3062 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: One of the recent applications of ion sources is their use for ion beam assisted deposition of thin films and coatings. This method combines a coating technique such as evaporation or sputtering with bombardment with ions in the keV energy range. The required ions with defined energy, flux, and impact angle are delivered from an ion source. An apparatus for ion beam assisted evaporation with a duoplasmatron ion source is described. The features of the duoplasmatron with respect to application for ion beam assisted deposition such as beam shape, uniformity and intensity, ion-to-neutral ratio, and focused and defocused mode are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142606
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    Paper (German National Licenses)
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  • 5
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    Technological progress in the SDI programme (1990)
    London : Periodicals Archive Online (PAO)
    Survival. 32:1 (1990:Jan./Feb.) 47 
    Details
    ISSN: 0039-6338
    Topics: Political Science
    Notes: Strategic Defences
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:4236-1990-032-01-000004
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Light-scattering investigations of the liquid-liquid phase transition of the ionic system: Trimethylethyl-ammonium bromide in chloroform (1994)
    Springer
    International journal of thermophysics 15 (1994), S. 1045-1056 
    Details
    ISSN: 1572-9567
    Keywords: chloroform ; critical phenomena ; ionic solution ; light scattering ; liquid-liquid phase transition ; ternary mixture ; trimethylethyl-ammonium bromide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Phase diagrams and light-scattering measurements of solutions of trimethylethyl-ammonium bromide in chloroform (ε=4.72 at 25 C) with an ethanol content of 1% are reported. The system has a lower critical point nearT = 25°C. The critical mole fraction is xc,=0.0503 ± 0.0002, which corresponds to the reduced variablesT c * =0.036 andc c * =0.029 of therestricted primitive model (RPM) and is slightly below the values predicted by the RPM for the critical parameters. The analysis of the scattering intensity at critical composition gives v = 0.631 ± 0.003 for the critical exponent of the correlation length Σ with an amplitude of 0.87± 0.01 nm. The system, a solution of a salt of essentially spherical ions of almost equal size in a simple low-dielectric polar liquid, with critical parameters very close to predictions of the RPM, nevertheless has an Ising critical point.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01458814
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Two-photon absorption of dissociating TLI in strong laser fields (1994)
    Springer
    The European physical journal 31 (1994), S. 67-73 
    Details
    ISSN: 1434-6079
    Keywords: 32.70.Jz ; 33.80.Gj ; 34.50.R
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In a strong laser field (I=2 GW/cm2) TlI is dissociated by a two-photon process and the Tl fragment is detected state specifically. The yield of Tl 6p 2 P 3/2 (Tl*) is measured as a function of the dissociation wavelength (480 nm–540 nm). If the dissociation wavelength is close to two-photon transitions of the Tl atom from 6p 2 P 3/2 to np2 P 1/2,3/2 or mf2 F 5/2,7/2,n=10 ... 15,m=7 ... 12 dips in the yield are observed. These dips show a significant asymmetric broadening, compared to a free atomic transition and the observation is interpreted as an absorption process of the transient state of dissociating TlI during the laser pulse. By applying the Landau-Zener approximation for the potential crossing of dressed molecular states, we are able to describe the broadening and the power density dependence of the observations. Simulations show that the asymmetry is determined by the difference potential of the electronic states which are coupled by the laser field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01426581
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    Paper (German National Licenses)
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