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  • 25.70.Np  (2)
  • Electrooptic effects  (2)
  • 25.70  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Controlled decay of electrically induced deformations in nematic liquid crystals (1973)
    Springer
    Applied physics 2 (1973), S. 349-350 
    Details
    ISSN: 1432-0630
    Schlagwort(e): Liquid crystals ; Electrooptic effects
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract The transient behavior of electrically induced deformations of parallel oriented nematic liquid crystal layers was investigated. The nematic material used was a mixture of disubstituted benzoyloxybenzoic acid esters the dielectric anisotropy of which is positive at dc and low frequencies, and changes sign in the kHz range. The decay time of a deformation induced by a low frequency field can be considerably reduced by switching the frequency to the range where the dielectric anisotropy is negative. This effect becomes even more pronounced for higher viscosities.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00896942
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  • 2
    Digitale Medien
    Digitale Medien
    Fréedericksz deformation in nematic liquid crystals with frequency dependent dielectric constant (1975)
    Springer
    Applied physics 6 (1975), S. 309-313 
    Details
    ISSN: 1432-0630
    Schlagwort(e): Liquid crystals ; Electrooptic effects ; Elastic deformations
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract The rise and decay times of a Fréedericksz deformation in a planar nematic layer have been investigated. The liquid crystal used was an ester mixture with regimes of positive as well as negative dielectric anisotropy. This property allows to control both the rise and the decay times of the deformation by switching the frequency of the electric field. The kinetics was monitored with a fluorescent dye-probe.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00883647
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  • 3
    Digitale Medien
    Digitale Medien
    Investigation of the sequential break-up mode6Li→6Li*(31 +)→α+d of 156 MeV6Li projectiles on208Pb in the very forward angular hemisphere (1991)
    Springer
    The European physical journal 339 (1991), S. 489-493 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 25.70.−z ; 25.70.Np ; 95.30.J
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The sequential break-up of 156 MeV6Li projectiles colliding with208Pb has been investigated in the very forward angular hemisphere in order to explore the role of the Coulomb and nuclear interaction in inducing projectile break-up processes. The experiments use the Karlsruhe spectrograph “Little John” with a newly developed technique to detect efficiently break-up pairs ofα-particles and deuterons emitted with small relative energies and within a small opening angle. The observed differential cross section for the projectile excitation6Li→6Li* (I=3i +) has been analysed (together with forward elastic scattering) by a coupled channel approach, and various sensitivities to the nuclear potential and other ingredients have been studied. We conclude, that in the angular region below half the grazing angle the excitation is completely due to the Coulomb force. This feature is a basis for an application of the disintegration approach for studies of radiative capture cross section of astrophysical interest.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01288432
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  • 4
    Digitale Medien
    Digitale Medien
    γ-γ Physics with peripheral relativistic heavy ion collisions (1988)
    Springer
    The European physical journal 330 (1988), S. 77-81 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 12.20.-m ; 11.80.-m ; 25.70.Np
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The high flux of equivalent photons present in relativistic heavy ion collisions of two chargesZ 1 andZ 2 gives rise to the collision of two equivalent photons. The cross-sections for various processes are directly related to the correspondingγ- γ cross-sections. As compared toγ- γ physics being studied at e+ e− colliders, we find that high energy states will not be so easily accessible at the existing facilities, however, the enhancement factor (Z 1 Z 2)2 in the expression for the cross section will provide very large photon fluxes for lower energies.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01287267
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  • 5
    Digitale Medien
    Digitale Medien
    Multiple electromagnetic excitation with relativistic heavy ions (1989)
    Springer
    The European physical journal 332 (1989), S. 203-208 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 25.20 ; 25.70 ; 21.60.E
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The multiple electromagnetic excitation with fast projectiles (heavy ions) is studied theoretically in the sudden approximation. Of special interest is the excitation of rotational states coupled to giant (dipole) vibrations. Closed form expressions are obtained for the excitation of a rigid rotor. The strong pulse of high energy equivalent photons in relativistic heavy ion collisions opens up new possibilities for nuclear structure studies, not possible e.g. with electron scattering or nuclear Raman scattering. It is also pointed out that the “Brink-hypothesis” can be investigated in a new way by means of multiple electromagnetic excitation with relativistic heavy ions of low lying states coupled to the giant dipole mode.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01289776
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