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- Dynamic_nuclear_polarisation abstract "Dynamic nuclear polarization (DNP)results from transferring spin polarization from electrons to nuclei, thereby aligning the nuclear spins to the extent that electron spins are aligned. Note that the alignment of electron spins at a given magnetic field and temperature is described by the Boltzmann distribution under the thermal equilibrium (see figure). It is also possible that those electrons are aligned to a higher degree of order by other preparations of electron spin order such as: chemical reactions (leading to Chemical-Induced DNP, CIDNP), optical pumping and spin injection. DNP is considered one of several techniques for hyperpolarization.When electron spin polarization deviates from its thermal equilibrium value, polarization transfers between electrons and nuclei can occur spontaneously through electron-nuclear cross relaxation and/or spin-state mixing among electrons and nuclei. For example, the polarization transfer is spontaneous after a homolysis chemical reaction. On the other hand, when the electron spin system is in a thermal equilibrium, the polarization transfer requires continuous microwave irradiation at a frequency close to the corresponding electron paramagnetic resonance (EPR) frequency. In particular, mechanisms for the microwave-driven DNP processes are categorized into the Overhauser effect (OE), the solid-effect (SE), the cross-effect (CE) and thermal-mixing (TM).The first DNP experiments were performed in the early 1950s at low magnetic fields but until recently the technique was of limited applicability for high-frequency, high-field NMR spectroscopy, because of the lack of microwave (terahertz) sources operating at the appropriate frequency. Today such sources are available as turn-key instruments, making DNP a valuable and indispensable method especially in the field of structure determination by high-resolution solid-state NMR spectroscopy".
- Dynamic_nuclear_polarisation thumbnail Polarization_600MHz.png?width=300.
- Dynamic_nuclear_polarisation wikiPageExternalLink hyperpolarization.blogspot.com.
- Dynamic_nuclear_polarisation wikiPageExternalLink issueID=CP012022&Type=Current.
- Dynamic_nuclear_polarisation wikiPageExternalLink 3-4.
- Dynamic_nuclear_polarisation wikiPageID "1119342".
- Dynamic_nuclear_polarisation wikiPageRevisionID "600740604".
- Dynamic_nuclear_polarisation hasPhotoCollection Dynamic_nuclear_polarisation.
- Dynamic_nuclear_polarisation subject Category:Chemical_physics.
- Dynamic_nuclear_polarisation comment "Dynamic nuclear polarization (DNP)results from transferring spin polarization from electrons to nuclei, thereby aligning the nuclear spins to the extent that electron spins are aligned. Note that the alignment of electron spins at a given magnetic field and temperature is described by the Boltzmann distribution under the thermal equilibrium (see figure).".
- Dynamic_nuclear_polarisation label "Dynamic nuclear polarisation".
- Dynamic_nuclear_polarisation label "Polarisation dynamique nucléaire".
- Dynamic_nuclear_polarisation sameAs Polarisation_dynamique_nucléaire.
- Dynamic_nuclear_polarisation sameAs m.047pv8.
- Dynamic_nuclear_polarisation sameAs Q976837.
- Dynamic_nuclear_polarisation sameAs Q976837.
- Dynamic_nuclear_polarisation wasDerivedFrom Dynamic_nuclear_polarisation?oldid=600740604.
- Dynamic_nuclear_polarisation depiction Polarization_600MHz.png.
- Dynamic_nuclear_polarisation isPrimaryTopicOf Dynamic_nuclear_polarisation.
