The spin diffusion in the dynamic polarization by solid effect

1973 ◽  
Vol 17 (1) ◽  
pp. 129-140
Author(s):  
V. Montelatici
Keyword(s):  
Spin Diffusion ◽  
Dynamic Polarization ◽  
Solid Effect

scholarly journals Three-spin solid effect and the spin diffusion barrier in amorphous solids

2019 ◽  
Vol 5 (7) ◽  
pp. eaax2743 ◽  
Author(s):  
Kong Ooi Tan ◽  
Michael Mardini ◽  
Chen Yang ◽  
Jan Henrik Ardenkjær-Larsen ◽  
Robert G. Griffin
Keyword(s):  
Diffusion Barrier ◽  
Nuclear Polarization ◽  
Spin Diffusion ◽  
Amorphous Solids ◽  
Second Step ◽  
Intimate Contact ◽  
Glycerol Water ◽  
Water Matrix ◽  
Solid Effect ◽  
Trityl Radical

Dynamic nuclear polarization (DNP) has evolved as the method of choice to enhance NMR signal intensities and to address a variety of otherwise inaccessible chemical, biological and physical questions. Despite its success, there is no detailed understanding of how the large electron polarization is transferred to the surrounding nuclei or where these nuclei are located relative to the polarizing agent. To address these questions we perform an analysis of the three-spin solid effect, and show that it is exquisitely sensitive to the electron-nuclear distances. We exploit this feature and determine that the size of the spin diffusion barrier surrounding the trityl radical in a glassy glycerol–water matrix is <6 Å, and that the protons involved in the initial transfer step are on the trityl molecule. 1H ENDOR experiments indicate that polarization is then transferred in a second step to glycerol molecules in intimate contact with the trityl.

Dynamic polarization of protons in radiation-damaged polyethylene by the solid effect

1966 ◽  
Vol 23 (1) ◽  
pp. 63-64 ◽  
Author(s):  
D.A. Hill ◽  
B.A. Hasher ◽  
C.F. Hwang
Keyword(s):  
Dynamic Polarization ◽  
Solid Effect

scholarly journals Room-temperature hyperpolarization of polycrystalline samples with optically polarized triplet electrons: pentacene or nitrogen-vacancy center in diamond?

2021 ◽  
Vol 2 (1) ◽  
pp. 33-48
Author(s):  
Koichiro Miyanishi ◽  
Takuya F. Segawa ◽  
Kazuyuki Takeda ◽  
Izuru Ohki ◽  
Shinobu Onoda ◽  
...  
Keyword(s):  
Benzoic Acid ◽  
Room Temperature ◽  
Spin Diffusion ◽  
Polarization Transfer ◽  
Nitrogen Vacancy ◽  
Nitrogen Vacancy Center ◽  
Direct Polarization ◽  
Solid Effect ◽  
Acid Sample ◽  
Vacancy Center

Abstract. We demonstrate room-temperature 13C hyperpolarization by dynamic nuclear polarization (DNP) using optically polarized triplet electron spins in two polycrystalline systems: pentacene-doped [carboxyl-13C] benzoic acid and microdiamonds containing nitrogen-vacancy (NV−) centers. For both samples, the integrated solid effect (ISE) is used to polarize the 13C spin system in magnetic fields of 350–400 mT. In the benzoic acid sample, the 13C spin polarization is enhanced by up to 0.12 % through direct electron-to-13C polarization transfer without performing dynamic 1H polarization followed by 1H−13C cross-polarization. In addition, the ISE has been successfully applied to polarize naturally abundant 13C spins in a microdiamond sample to 0.01 %. To characterize the buildup of the 13C polarization, we discuss the efficiencies of direct polarization transfer between the electron and 13C spins as well as that of 13C−13C spin diffusion, examining various parameters which are beneficial or detrimental for successful bulk dynamic 13C polarization.

scholarly journals Room temperature hyperpolarization of polycrystalline samples with optically polarized triplet electrons: Pentacene or Nitrogen-Vacancy center in diamond?

2020 ◽  
Author(s):  
Koichiro Miyanishi ◽  
Takuya F. Segawa ◽  
Kazuyuki Takeda ◽  
Izuru Ohki ◽  
Shinobu Onoda ◽  
...  
Keyword(s):  
Benzoic Acid ◽  
Room Temperature ◽  
Spin Diffusion ◽  
Polarization Transfer ◽  
Nitrogen Vacancy ◽  
Nitrogen Vacancy Center ◽  
Direct Polarization ◽  
Solid Effect ◽  
First Time ◽  
Acid Sample

Abstract. We demonstrate room-temperature 13C hyperpolarization by dynamic nuclear polarization (DNP) using optically polarized triplet electron spins in two polycrystalline systems: pentacene-doped [carboxyl-13C] benzoic acid and microdiamonds containing NV- centers. For both samples, the integrated solid effect (ISE) is used to polarize the 13C spin system in magnetic fields of 350–400 mT. In the benzoic acid sample, the 13C spin polarization is enhanced up to 0.12 % through direct electron-to-13C polarization transfer without performing dynamic 1H polarization followed by 1H-13C cross polarization. In addition, ISE has been successfully applied for the first time to polarize naturally abundant 13C spins in a microdiamond sample to 0.01 %. To characterize the buildup of the 13C polarization, we discuss the efficiencies of direct polarization transfer between the electron and 13C spins as well as that of 13C–13C spin diffusion, examining various parameters which are beneficial or detrimental for successful bulk dynamic 13C polarization.

A contribution to the study of dynamic polarization by solid effect

1970 ◽  
Vol 68 (2) ◽  
pp. 253-281 ◽  
Author(s):  
G. Baldacchini ◽  
V. Montelatici
Keyword(s):  
Dynamic Polarization ◽  
Solid Effect

scholarly journals Dynamic nuclear polarization and ESR hole burning in As doped silicon

2020 ◽  
Vol 22 (18) ◽  
pp. 10227-10237 ◽  
Author(s):  
J. Järvinen ◽  
D. Zvezdov ◽  
J. Ahokas ◽  
S. Sheludiakov ◽  
L. Lehtonen ◽  
...  
Keyword(s):  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Spin Diffusion ◽  
Hole Burning ◽  
Doped Silicon ◽  
Solid Effect ◽  
Decoupling Effect

Electron decoupling effect on Overhauser DNP, solid effect DNP and spin diffusion are measured with EPR in As doped silicon.

Dynamic nuclear polarization assisted spin diffusion for the solid effect case

2011 ◽  
Vol 134 (7) ◽  
pp. 074509 ◽  
Author(s):  
Yonatan Hovav ◽  
Akiva Feintuch ◽  
Shimon Vega
Keyword(s):  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Spin Diffusion ◽  
Solid Effect

EPR studies on fluorocarbon microspheres. Dynamic polarization of fluorine nuclei and adsorbed He3

1984 ◽  
Vol 45 (6) ◽  
pp. 1033-1038 ◽  
Author(s):  
M. Chapellier ◽  
L. Sniadower ◽  
G. Dreyfus ◽  
H. Alloul ◽  
J. Cowen
Keyword(s):  
Dynamic Polarization

Nuclear spin diffusion in a rare spin species

1982 ◽  
Vol 43 (7) ◽  
pp. 1049-1058 ◽  
Author(s):  
M. Goldman ◽  
J.F. Jacquinot
Keyword(s):  
Nuclear Spin ◽  
Spin Diffusion ◽  
Spin Species

Longitudinal electronic and nuclear spin diffusion in atomic hydrogen

1985 ◽  
Vol 46 (8) ◽  
pp. 1335-1344 ◽  
Author(s):  
J.P. Bouchaud ◽  
C. Lhuillier
Keyword(s):  
Nuclear Spin ◽  
Atomic Hydrogen ◽  
Spin Diffusion
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