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  • 1
    Digitale Medien
    Digitale Medien
    Anisotropy of the nonlinear optical susceptibility χ(3) in polydiacetylene single crystals (1994)
    Springer
    Applied physics 59 (1994), S. 203-209 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.65
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The anisotropy ofχ (3) in Poly-bis(p-Toluene Sulfonate) of 2.4-hexadiyne-1.6-diol (PTS) PolyDiAcetylene (PDA) single crystals is investigated by Degenerate Four-Wave Mixing (DFWM) at a wavelength of 720 nm. The symmetries ofχ (3)(−ω;ω, −ω,ω) identify the non-vanishing and independent components of the tensor. For the calculation of the χ(3) elements from the measured values, the anisotropy of both the linear optical index of refraction and the absorption coefficient is included in the coupled wave approach. A magnitude of 10−10 esu is measured for theχ (3) component if all beam polarizations are parallel to the polymer chains. The least upper bound for all other measurable components is estimated to be 10−12 esu. The results for the intensity dependence of the DFWM signal are explained in terms of a thermooptic effect. Measurements on the orientational dependence of the DFWM signal in the samples are carried out, and the influence of the anisotropy of the linear optical parameters on the measured curves is discussed. A method for the preparation of thin layered polymer single crystals of poly-bis (4-ButoxyCarbonyle-Methylene-Urethane) of 4.6-decadiyne-1.1-diol (4-BCMU) and the first DFWM measurements on these samples are presented.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01081171
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Erythrosin and pH gradient induced photo-voltages in bilayer membranes (1982)
    Springer
    The journal of membrane biology 65 (1982), S. 147-153 
    Details
    ISSN: 1432-1424
    Schlagwort(e): bilayer membranes ; dye photo-deprotonation ; erythrosin ; fluorescein ; membrane photo-voltages ; xanthene dyes
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Summary Erythrosin and light flashes induce voltage transients across bilayer membranes in the presence of transmembrane pH gradients. Fast voltage transients, which rise in 〈50 nsec and fall in ∼500 nsec, are attributed to photo-deprotonation of dye sorbed in the glycerol region of phospholipid membranes. Six other halogenated xanthene dyes induce similar effects, which apparently resulted from triplet states of monoanionic dye. No photo-effects were observed with fluorescein.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01870478
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