Linearly polarised light

Linear dichroism data with DNA oriented by an electric field [53, 54] or a linear flow [55, 56], under linearly polarised light, lead to determinations of the angle between the absorbing transition dipole moment of the chromophore in the molecule and the DNA helix axis conclusions concerning intercalation may thus be drawn from this technique. Finally, with chiral compounds, circular dichroism is also an attractive method to determine the enantioselectivity in the binding of the molecule [48, 57,58]. 

Figure 3. Optical power limiting due to self-focusing in bis [1,2-dimethyl-1,2-ethenedithiolato(2-)-S,S ] Nickel (linear polarised light).

Linearly polarised light can be understood as the superposition of two circularly polarised light rays of the same frequency, velocity, and amplitude (inten-... 

Linearly polarised light of the emission above the threshold. 

When the helix is completely unwound a clear state is produced as a consequence of the formation of a pseudonematic phase with no helical structure from the corresponding chiral nematic phase. The analyser then absorbs linearly polarised light. Therefore, black information can be displayed at the appropriate pixels against a white background to produce an image with positive contrast. The threshold voltage for the unwinding of the helix is dependent on a number of physical parameters ... 

An additional advantage of the use of reactive, photopolymerisable liquid crystalline monomers with charge transfer or electroluminescent properties is the ability to generate circularly and linearly polarised light. This possibility... 

These monoliths were then irradiated with linearly polarised light, causing only those template molecules having a transitional dipole moment aligned with that of the light source to photoreact with the polymer backbone within the MIP binding site. This is shown schematically in Fig. 20.3. 

FtKIire I , Three types of molecular rcnncnlarion or phwochiumii liquid-cryslalline polymers irradiated with linearly polarised light. 

If such a retarder is placed with its optic axis aligned exactly with the x or y directions, however, no change in the polarisation is induced, i.e. linearly polarised light stays linearly polarised. A combination of linear polariser and quarter wave plate can therefore be used to create any state of polarisation by proper orientation of their relative azimuths. 

These considerations can be applied in practice to the determination of the polarisation only if, during the process, at least one direction in space is kept fixed for all atoms by external conditions, e.g. an external field. In other cases the orientations of the atoms would be irregular and no polarisation could be established. If, for example, a certain CT had the same direction for all atoms, then to this would correspond a linearly polarised light wave with the... 

If the fluorescence of a sample is exeited by linearly polarised light the fluores-eenee is partially polarised (see Fig. 5.7 and Fig. 5.8). The fluorescence anisotropy, r, is defined as... 

Fig. 1.11 Below Two single crystals of the polydiacetylene paratoluyl-sulfonyl-oximethylene-diacetylene (TS6). Above three monomer crystals, illuminated with linearly polarised light. The polarisation direction of the light is horizontal, and the b axis of the polymer chains is oriented parallel to the long axis of the crystals. The polymer crystals strongly reflect light (below left) when the light...

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