By Peter Schreier
For readers at the least reasonably conversant in the idea of reading unstable aroma compounds, an advent to the wide variety of options for interpreting chiral molecules. They contain chiroptical tools resembling polarimetry, optical rotation dispersion and round dichroism; liquid, fuel, great
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Additional info for Analysis of Chiral Organic Molecules: Methodology and Applications
28 3 Techniques used in the analysis of optically active compounds CD represents the differential absorption of left circularly polarized (LCP) and right circularly polarized (RCP) light. The effect of the differential absorption is that when the electric vector projections associated with the LCP and RCP light are recombined after leaving the <:hiral medium, they describe an ellipse whose major axis lies along the new angle of rotation. The measure of the eccentricity of this ellipse is defined as the ellipticity 'If.
Whenever there is a sudden, large change in the refractive index, such as when a high concentration of material passes through, the laser beam is distorted and will not pass through the analyzer and the apertures properly. A similar problem exists when absorption processes cause thermal lensing. This can, in principle, be avoided by choosing an appropriate laser wavelength. Bubbles trapped inside the cell may also be a problem, particularly when the cell is used initially. 12 Function principle of the polarimetric LC detector ChiraMonitor (ACS, UK).
Asymmetric Synthesis (J. D.