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Více informací o knize Chemically Induced Dynamic Nuclear and Electron Polarizations-CIDNP and CIDEP

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Anotace knihy

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.

Parametry knihy

Zařazení knihy Knihy v angličtině Mathematics & science Chemistry Organic chemistry

• Plný název: Chemically Induced Dynamic Nuclear and Electron Polarizations-CIDNP and CIDEP
• Autor: P. Granger
• Jazyk: Angličtina
• Vazba: Brožovaná
• Počet stran: 130
• EAN: 9783642657955
• ISBN: 9783642657955
• ID: 06620715
• Nakladatelství: Springer-Verlag Berlin and Heidelberg GmbH & Co. KG
• Hmotnost: 249 g
• Rozměry: 244 × 170 × 8 mm
• Datum vydání: 15. November 2011

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