Advanced ESR Methods in Polymer Research by Shulamith Schlick PDF

By Shulamith Schlick

ISBN-10: 0470053496

ISBN-13: 9780470053492

ISBN-10: 0471731897

ISBN-13: 9780471731894

A definitive paintings on ESR and polymer technology by means of brand new best authoritiesThe prior 20 years have visible striking advances in electron spin resonance (ESR) suggestions, quite as they practice to polymeric fabrics. With contributions from over a dozen of the world's best polymer scientists, complex ESR equipment in Polymer examine is the 1st booklet to assemble the entire present traits during this intriguing box into one finished reference.Part I establishes the basics of ESR, from experimental innovations to information research, and serves as a helpful assessment for the start ESR scholar. half II introduces the wide variety of ESR purposes to polymeric platforms, together with residing radical polymerization, block copoly-mers, polymer strategies, ion-containing polymers, polymer lattices, membranes in gas cells, degradation, polymer coatings, dendrimers, and conductive polymers. via exposing readers to the nice strength of ESR, the authors desire to inspire extra large software of those tools.

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Qxd 8/8/2006 22 1:20 PM Page 22 CONTINUOUS-WAVE AND PULSED ESR METHODS point a π/2 pulse is applied instead of the π pulse of the two-pulse echo sequence. The π/2 pulse converts transverse magnetization with zero phase (+x) to negative longitudinal magnetization ( Ϫz), it does not influence magnetization with phase +y (φ ϭ 90°) or Ϫy (φ ϭ 270°), and it converts magnetization with phase Ϫx (φ ϭ 180°) to positive longitudinal magnetization (ϩz). As the magnetization before this pulse is equally distributed over the xy plane, only part of it is transferred to longitudinal magnetization.

1. Dipole–Dipole Coupling The magnetic moments that are associated with electron and nuclear spins interact through space by the dipole–dipole coupling. This coupling is a pair interaction. Throughout this chapter we deal with experiments whose output data can be described as sums (ENDOR) or products (ELDOR, ESEEM) of pair contributions, which simplifies analysis tremendously. Furthermore, in all these experiments we can distinguish between an observer spin S and pumped spins Ii that are coupled to the observer spin.

This coupling is a pair interaction. Throughout this chapter we deal with experiments whose output data can be described as sums (ENDOR) or products (ELDOR, ESEEM) of pair contributions, which simplifies analysis tremendously. Furthermore, in all these experiments we can distinguish between an observer spin S and pumped spins Ii that are coupled to the observer spin. We may neglect the couplings of the pumped spins Ii among themselves. Therefore, we may restrict our general considerations to a spin pair of one observer spin S, which is always an electron spin, and one pumped spin I, which may be either an electron spin (ELDOR) or a nuclear spin (ENDOR, ESEEM).

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Advanced ESR Methods in Polymer Research by Shulamith Schlick


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