scholarly journals Viscosity effects on optically generated electron and nuclear spin hyperpolarization

2020 ◽  
Vol 22 (48) ◽  
pp. 28173-28182
Author(s):  
Matthew W. Dale ◽  
Daniel J. Cheney ◽  
Claudio Vallotto ◽  
Christopher J. Wedge
Keyword(s):  
Spin Polarization ◽  
Electron Spin ◽  
Dynamic Nuclear Polarization ◽  
Nuclear Spin ◽  
Nuclear Polarization ◽  
Electron Spin Polarization ◽  
Viscosity Effects

Optically-generated dynamic nuclear polarization is increased in viscous mixtures due to longer lived electron spin polarization.

scholarly journals Dynamic nuclear polarization from current-induced electron spin polarization

2014 ◽  
Vol 90 (8) ◽  
Author(s):  
C. J. Trowbridge ◽  
B. M. Norman ◽  
Y. K. Kato ◽  
D. D. Awschalom ◽  
V. Sih
Keyword(s):  
Spin Polarization ◽  
Electron Spin ◽  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Electron Spin Polarization

The electron depolarization during dynamic nuclear polarization: measurements and simulations

2015 ◽  
Vol 17 (1) ◽  
pp. 226-244 ◽  
Author(s):  
Y. Hovav ◽  
I. Kaminker ◽  
D. Shimon ◽  
A. Feintuch ◽  
D. Goldfarb ◽  
...  
Keyword(s):  
Spin Polarization ◽  
Electron Spin ◽  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Electron Spin Polarization ◽  
Epr Spectrum ◽  
Polarization Measurements

Measurements and simulations of the electron spin polarization along the EPR spectrum of TEMPOL and trityl radicals, under DNP conditions.

Chemically Induced Dynamic Nuclear Polarization During Irradiation of Phenol in the Presence of Amides

1975 ◽  
Vol 53 (16) ◽  
pp. 2459-2464
Author(s):  
Shiv P. Vaish ◽  
Holger E. Chen ◽  
Micha Tomkiewicz ◽  
Robert D. McAlpine ◽  
Michael Cocivera
Keyword(s):  
Carbonyl Group ◽  
Spin Polarization ◽  
Dynamic Nuclear Polarization ◽  
Nuclear Spin ◽  
Nuclear Polarization ◽  
Radical Pair ◽  
Hydroxybenzoic Acid ◽  
Nuclear Spin Polarization ◽  
Ph Values ◽  
Chemically Induced

Irradiation of D2O solutions containing various phenols with aliphatic amides at pH values between 9 and 12 results in nuclear spin polarization which is observed as n.m.r. emission signals during irradiation. No polarization is observed for the phenols which include tyrosine, cresol, p-hydroxybenzoic acid, phenol, and others. For the amides which include acetamide, propionamide, N-methylacetamide, and N,N-dimethylacetamide, polarization was observed for only the protons on the carbon bonded to the carbonyl group. Because excited phenolate ions are known to eject electrons, it is proposed that the radical RĊ(O−)NR2 is formed by reaction of the amide with the hydrated electron. The polarization observed for the amides can be explained by reaction of RĊ(O−)NR2 with a benzosemiquinone radical via a radical pair.

scholarly journals Maximizing NMR signal per unit time by facilitating the e–e–n cross effect DNP rate

2018 ◽  
Vol 20 (43) ◽  
pp. 27646-27657 ◽  
Author(s):  
Alisa Leavesley ◽  
Sheetal Jain ◽  
Ilia Kamniker ◽  
Hui Zhang ◽  
Suchada Rajca ◽  
...  
Keyword(s):  
Spin Relaxation ◽  
Electron Spin ◽  
Dynamic Nuclear Polarization ◽  
Nuclear Spin ◽  
Nuclear Polarization ◽  
Nuclear Spin Relaxation ◽  
Cross Effect ◽  
Spin Clusters

Dynamic nuclear polarization (DNP) efficiency is critically dependent on the properties of the radical, solvent, and solute, where electron spin clusters will shorten nuclear spin relaxation and enhance CE-DNP.

scholarly journals Nuclear spin dynamics influenced and detected by electron spin polarization in CdTe/(Cd,Mg)Te quantum wells

2019 ◽  
Vol 99 (4) ◽  
Author(s):  
E. Evers ◽  
T. Kazimierczuk ◽  
F. Mertens ◽  
D. R. Yakovlev ◽  
G. Karczewski ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Spin Polarization ◽  
Electron Spin ◽  
Nuclear Spin ◽  
Spin Dynamics ◽  
Electron Spin Polarization

Dynamical Nuclear Polarization

2018 ◽  
Author(s):  
M. M. Glazov
Keyword(s):  
Spin Polarization ◽  
Nuclear Spin ◽  
Nuclear Polarization ◽  
Magnetic Moments ◽  
Nonlinear Effects ◽  
Many Body ◽  
Nuclear Spin Polarization ◽  
Optical Resonances ◽  
Dynamical Nuclear Polarization ◽  
Temperature Concept

The transfer of nonequilibrium spin polarization between the electron and nuclear subsystems is studied in detail. Usually, a thermal orientation of nuclei in magnetic field is negligible due to their small magnetic moments, but if electron spins are optically oriented, efficient nuclear spin polarization can occur. The microscopic approach to the dynamical nuclear polarization effect based on the kinetic equation method, along with a phenomenological but very powerful description of dynamical nuclear polarization in terms of the nuclear spin temperature concept is given. In this way, one can account for the interaction between neighbouring nuclei without solving a complex many-body problem. The hyperfine interaction also induces the feedback of polarized nuclei on the electron spin system giving rise to a number of nonlinear effects: bistability of nuclear spin polarization and anomalous Hanle effect, dragging and locking of optical resonances in quantum dots. Theory is illustrated by experimental data on dynamical nuclear polarization.

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