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- W2329523147 abstract "Proton and fluorine spin polarizations in solutions of optically excited p-benzoquinones are shown to stem from the triplet states of the quinones. The phenomenon is analogous to the Optical Nuclear Polarization (ONP) effect in solids. ONP in solution is detected only if the relaxation processes among the triplet sublevels cannot destroy the polarization during the lifetimes of the triplets totally. The quinones are unique in having extremely short lived triplets. Therefore, ONP can be detected in their ground states by high resolution nmr, which allows to map out the electron distribution of the triplet states.Durch UV-Bestrahlung von Molekulen in Losung kann eine Spinpolansation ihrer magnetischen Atomkerne induziert werden, ohne das dabei chemische Veranderungen der Ausgangsmaterialien eintreten. Die Polarisation wird durch die kernspinabhangigen Be- und Entvolkerungsraten der Triplett-Energieniveaus in einem auseren Magnetfeld aufgebaut und auf den Grundzustand der Molekule ubertragen, wo sie durch hochauflosende Kernspinresonanz nachgewiesen wird. Analog zur “Optisch Induzierten Kernpolarisation” in Festkorpern kann damit auch in Flussigkeiten eine Kernpolarisation induziert werden, vorausgesetzt das die Triplett-Lebensdauern extrem kurz (Nanosekunden) und die Kernspin-Relaxationszeiten in den Triplettzustanden relativ lang sind. Die hochaufgelosten Kernpolarisations-spektren gestatten eine Bestimmung der Elektronenverteilung in den Triplettzustanden der angeregten Molekule. Chemische Verbindungen, die alle obigen Voraussetzungen erfullen, sind im wesentlichen die Chinone und aromatische Heterozyklen." @default.
- W2329523147 created "2016-06-24" @default.
- W2329523147 creator A5049710711 @default.
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- W2329523147 date "1975-02-25" @default.
- W2329523147 modified "2023-10-17" @default.
- W2329523147 title "ChemInform Abstract: NUCLEAR SPIN POLARIZATION FROM TRIPLET STATES IN SOLUTION" @default.
- W2329523147 doi "https://doi.org/10.1002/chin.197508078" @default.
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