By Laurence D. Barron
ISBN-10: 0511231210
ISBN-13: 9780511231216
ISBN-10: 0521813417
ISBN-13: 9780521813419
Starting from the physics of easy debris to the constitution of viruses, the subject material of this ebook stresses the significance of optical task and chirality in glossy technology and may be of curiosity to a variety of scientists. utilizing classical and quantum tools with a powerful emphasis on symmetry rules, the quantity develops the idea of assorted optical task and comparable phenomena from the viewpoint of molecular scattering of polarized mild
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Extra info for Molecular Light Scattering and Optical Activity
Example text
The ellipticity maximum coincides with the point of inflection in the curve of optical rotatory dispersion, which ideally coincides with the maximum of an electronic absorption band at λ j . 2 Natural optical rotation 7 ellipticity 0 λj λ rotation Fig. 4 The ellipticity and anomalous optical rotatory dispersion in the region of the electronic absorption wavelength λ j . The signs shown here correspond to a positive Cotton effect. and optical rotatory dispersion curves always have the relative signs shown in Fig.
The first sentence is essentially the definition used today. Strictly speaking, the term ‘enantiomorph’ is usually reserved for a macroscopic object such as a crystal, and ‘enantiomer’ for a molecule, but because of the ambiguity of scale in the case 26 A historical review of optical activity (a) (b) Fig. 11 (a) A holohedral hexagonal crystal. (b) A hemihedral hexagonal crystal and its mirror image. of general physical systems these two terms are used as synonyms in this book. The group theoretical criterion for an object to be chiral is that it must not possess improper rotation symmetry elements such as a centre of inversion, reflection planes or rotation–reflection axes and so must belong to one of the point groups Cn , Dn , O, T or I.
5. The diamagnetic rotation curve shown is actually the resultant of two equal and opposite optical rotatory dispersion curves for two adjacent electronic absorption bands, and is usually symmetric. The paramagnetic rotation curve is like an optical rotatory dispersion curve for a single absorption band, and is usually unsymmetric. Faraday had looked for the effect of a magnetic field on a source of radiation, but without success because strong fields and spectroscopes of good resolution were not available to him.
Molecular Light Scattering and Optical Activity by Laurence D. Barron
by James
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