Dynamic nuclear polarization induced by hot electrons
نویسندگان
چکیده
منابع مشابه
Chemically Induced Dynamic Nuclear Polarization
N M R emission and e n h a n c e d absorpt i on o f p roduc t s o f radical react ions ( C I D N P ) is e x p l a i n e d b y nuc lear spin d e p e n d e n t ad iabat i c transit ions be tween singlet a n d tr iplet states o f transient radical pairs. I n m a g n e t i c fields larger than a b o u t 1 k G o n l y S — To-transit ions c ont r ibute t o nuc lear polar izat ion. F r o m a k inet i ...
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Dynamic nuclear polarization (DNP) in combination with subsequent dissolution of the sample allows the detection of low-γ nuclei in the solution state with a signal gain of up to tens of thousand times compared to experiments starting from Boltzmann conditions. The long polarization build-up times of typically more than one hour are a drawback of this technique. The combination of dissolution D...
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The classical method to increase the nuclear spin polarization is the "solid effect" mainly developed by Abragam and Jeffries, where the Boltzmann polarization of unpaired electrons present in the sample is transferred to the nuclei by inducing forbidden transitions which flip one nucleus and one electron simultaneously (1,2). A different method is the optical nuclear polarization (ONP) which w...
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ژورنال
عنوان ژورنال: Applied Physics Letters
سال: 2007
ISSN: 0003-6951,1077-3118
DOI: 10.1063/1.2431779