Download Advances in Catalysis and Related Subjects, Volume 12 by W G Frankenberg PDF

By W G Frankenberg

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Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93 1V. Conclusion.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111 I. introduction Atomic nuclei and electrons possess magnetic dipole moments. I n the techniques of magnetic resonance spectroscopy, this property of nuclei and electrons is utilized by the application of a magnetic field to produce a number of energy levels by Zeeman splitting of the quantum states of the magnetic moment.

In the presence of a large external magnetic field, the neighbors will be oriented relative t o the field and there will be a large number of possible local fields which a nucleus can experience in addition to the external field. For a completely random distribution of a large number of near neighbors, a Gaussian distribution of local fields is expected, with the result that the shape of the resonance absorption line is Gaussian or bell-shaped. 1 gauss so that local fields and resulting line widths can be of the order of tens of gauss due to the dipoledipole interaction.

32 B. Electron Paramagnetic Resonance (EPR) . . . . . . . . . . . . . . . 33 11. Nuclear Magnetic Resonance.. . . . . . . . . . . . . . . . . . . . . 34 A. Principles and Methods of NMR.. B. Interactions of Nuclei in the Solid State. C. Applications. . . . . . . . . . . . . . . . . . . . . . . . . Ill. Electron Paramagnetic Resonance. . . . . . . . . . . . . . . . . . . . 76 A.

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