Dynamic Nuclear Polarization of Liquid Helium-Three by Optical Pumping

1968 ◽  
Vol 170 (1) ◽  
pp. 276-285 ◽  
Author(s):  
H. H. McAdams
Keyword(s):  
Liquid Helium ◽  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Optical Pumping ◽  
Helium Three

Dynamic nuclear polarization of liquid helium-three

1997 ◽  
Vol 12 (4) ◽  
pp. 513-516 ◽  
Author(s):  
B. Bleaney
Keyword(s):  
Liquid Helium ◽  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Helium Three

NMR 29Si and Dynamic Nuclear Polarization Induced by Optical Pumping in Compensated Silicon

1979 ◽  
pp. 153-153
Author(s):  
L. S. Vlasenko ◽  
N. T. Bagraev ◽  
R. A. Zhitnikov
Keyword(s):  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Optical Pumping

SABRE Hyperpolarization of Bipyridine Stabilized Ir-Complex at High, Low and Ultralow Magnetic Fields

2017 ◽  
Vol 231 (3) ◽  
Author(s):  
Andrey N. Pravdivtsev
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Magnetic Fields ◽  
Dynamic Nuclear Polarization ◽  
Signal Amplification ◽  
Nuclear Polarization ◽  
Optical Pumping ◽  
Spin Exchange ◽  
Spin Exchange Optical Pumping ◽  
Wide Range

AbstractA strong limitation of nuclear magnetic resonance is its low inherent sensitivity that can be overcome by using an appropriate hyperpolarization technique. Presently, dynamic nuclear polarization and spin-exchange optical pumping are the only hyperpolarization techniques that are used in applied medicine. However, both are relatively complex in use and expensive. Here we present a modification of the signal amplification by reversible exchange (SABRE) hyperpolarization method – SABRE on stabilized Ir-complexes. A stabilized Ir-complex (here we used bipyridine for stabilization) can be hyperpolarized in a wide range of magnetic fields from a few μT upto 10 T with

scholarly journals A cryogen-free, semi-automated apparatus for bullet-dynamic nuclear polarization with improved resolution

2021 ◽  
Author(s):  
Karel Kouřil ◽  
Michel Gramberg ◽  
Michael Jurkutat ◽  
Hana Kouřilová ◽  
Benno Meier
Keyword(s):  
Liquid Helium ◽  
Dynamic Nuclear Polarization ◽  
Liquid State ◽  
Nmr Spectra ◽  
Nuclear Polarization ◽  
Small Sample ◽  
Signal Loss ◽  
Manual Work ◽  
Dissolution Dynamic Nuclear Polarization

Abstract. In dissolution-dynamic nuclear polarization, a hyperpolarized solid is dissolved with a jet of hot solvent. The solution is then transferred to a secondary magnet, where spectra can be recorded with improved sensitivity. In bullet-dynamic nuclear polarization this order is reversed. Pressurized gas is used to rapidly transfer the hyperpolarized solid to the secondary magnet, and the hyperpolarized solid is dissolved only upon arrival. A potential advantage of this approach is that it may avoid excessive dilution and the associated signal loss, in particular for small sample quantities. Previously, we have shown that liquid-state NMR spectra with polarization levels of up to 30 % may be recorded within less than 1 second after the departure of the hyperpolarized solid from the polarizing magnet. The resolution of the recorded spectra however was limited. The system consumed substantial amounts of liquid helium and substantial manual work was required in between experiments to prepare for the next shot. Here, we present a new bullet-DNP system that addresses these limitations.

scholarly journals A cryogen-free, semi-automated apparatus for bullet-dynamic nuclear polarization with improved resolution

2021 ◽  
Vol 2 (2) ◽  
pp. 815-825
Author(s):  
Karel Kouřil ◽  
Michel Gramberg ◽  
Michael Jurkutat ◽  
Hana Kouřilová ◽  
Benno Meier
Keyword(s):  
Liquid Helium ◽  
Dynamic Nuclear Polarization ◽  
Liquid State ◽  
Nmr Spectra ◽  
Nuclear Polarization ◽  
Small Sample ◽  
Signal Loss ◽  
Manual Work ◽  
Dissolution Dynamic Nuclear Polarization

Abstract. In dissolution-dynamic nuclear polarization, a hyperpolarized solid is dissolved with a jet of hot solvent. The solution is then transferred to a secondary magnet, where spectra can be recorded with improved sensitivity. In bullet-dynamic nuclear polarization this order is reversed. Pressurized gas is used to rapidly transfer the hyperpolarized solid to the secondary magnet, and the hyperpolarized solid is dissolved only upon arrival. A potential advantage of this approach is that it may avoid excessive dilution and the associated signal loss, in particular for small sample quantities. Previously, we have shown that liquid-state NMR spectra with polarization levels of up to 30 % may be recorded within less than 1 s after the departure of the hyperpolarized solid from the polarizing magnet. The resolution of the recorded spectra however was limited. The system consumed significant amounts of liquid helium, and substantial manual work was required in between experiments to prepare for the next shot. Here, we present a new bullet-DNP (dynamic nuclear polarization) system that addresses these limitations.

Development of a dynamic nuclear polarization system based on the optical pumping method

2007 ◽  
Vol 310 (2) ◽  
pp. 2716-2718
Author(s):  
Atsushi Goto ◽  
Kenjiro Hashi ◽  
Tadashi Shimizu ◽  
Shinobu Ohki
Keyword(s):  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Optical Pumping

Porphyrins as Versatile, Aggregation-Tolerant, and Biocompatible Polarizing Agents for Triplet Dynamic Nuclear Polarization of Biomolecules

2021 ◽  
pp. 2645-2650
Author(s):  
Tomoyuki Hamachi ◽  
Koki Nishimura ◽  
Hironori Kouno ◽  
Yusuke Kawashima ◽  
Kenichiro Tateishi ◽  
...  
Keyword(s):  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization
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