Microwave-gated dynamic nuclear polarization
نویسندگان
چکیده
منابع مشابه
Microwave Induced Nuclear Polarization
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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Hyperpolarization by Dissolution Dynamic Nuclear Polarization is usually achieved by monochromatic microwave irradiation of the ESR spectrum of free radicals embedded in glasses at 1.2 K and 3.35 T. Hovav et al. (2014) have recently shown that by using frequency-modulated (rather than monochromatic) microwave irradiation one can improve DNP at 3.35 T in the temperature range 10–50 K. We show in...
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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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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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ژورنال
عنوان ژورنال: Physical Chemistry Chemical Physics
سال: 2016
ISSN: 1463-9076,1463-9084
DOI: 10.1039/c6cp05587g