Chemically Induced Dynamic Nuclear and Electron Polarizations-CIDNP and CIDEP (Paperback, Softcover reprint of the original 1st ed. 1974)

Anomalous electron-spin state populations in the Electron Paramagnetic Re sonance (EPR) spectra of radicals formed during radio lysis experiments were observed in 1963 by FESSENDEN and SCHULER [170a]. This phenomenon did not receive much attention at the time. In 1967, BARGON, FISCHER, and JOHNSEN [5] and independently WARD and LAWLER [7,8] reported a similar phenomenon for Nuclear Magnetic Resonance (NMR) spectra taken during radical reactions: emission or enhanced absorption, or both. The earliest attempts to explain this new NMR phenomenon treated these effects in a way similar to that of Dynamic Nuclear Polarization (DNP) or the Overhauser effect. Although the polarization has a completely different origin, DNP gave its name to this effect: Chemically Induced Dynamic Nuclear Polariza tion (CIDNP). [The name Chemically Induced Dynamic Electron Polarization (CIDEP) was introduced later by analogy with CIDNP]. After the initial publica tions, all the new data demonstrated that the first theory could not be correct. In 1969, a new theory was proposed by CLOSS [18] and independently by KAPTEIN and OOSTERHOFF [23] and called the radical-pair theory. This mechanism was proposed to account for the observations of polarization in both NMR and EPR. The radical-pair theory is based on weak interactions in a pair of radicals: the strength of interaction between the electronic states of the radicals depends in particular on the nuclear-spin states.

General

Imprint:	Springer-Verlag
Country of origin:	Germany
Series:	NMR Basic Principles and Progress, 8
Release date:	November 2011
First published:	1974
Authors:	C. Richard • P. Granger
Dimensions:	244 x 170 x 7mm (L x W x T)
Format:	Paperback
Pages:	130
Edition:	Softcover reprint of the original 1st ed. 1974
ISBN-13:	978-3-642-65795-5
Categories:	Books > Science & Mathematics > Chemistry > Organic chemistry > General Books > Science & Mathematics > Chemistry > Physical chemistry > General
LSN:	3-642-65795-8
Barcode:	9783642657955

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