☆ 4.3 Article

Frequency-swept dynamic nuclear polarization

JOURNAL OF MAGNETIC RESONANCE (2023)

Related references

Note: Only part of the references are listed.

Article Chemistry, Physical

Amplified Overhauser DNP with Selective Deuteration: Attenuation of Double-Quantum Cross-Relaxation

Ravi Shankar Palani et al.

Summary: In this study, selective 2H labeling of BDPA was utilized to investigate the dynamic nuclear polarization (DNP) mechanism of the Overhauser Effect (OE) in insulating solids. It was found that the alpha and gamma 1H spins on the fluorene rings were responsible for generating a positive bulk polarization, while the phenyl 1H spins contributed negative enhancements that attenuated the OE-DNP. Phenyl-d5-BDPA showed over 50% improvement in OE-DNP enhancement compared to h21-BDPA, achieving a maximum of approximately 90 at 14.1 T and 5 kHz MAS.

JOURNAL OF PHYSICAL CHEMISTRY LETTERS (2023)

Add to Collection

Article Chemistry, Physical

Resonant Mixing Dynamic Nuclear Polarization

Yifan Quan et al.

Summary: We propose a new mechanism for dynamic nuclear polarization called Resonant Mixing (RM). It arises from the evolution of the density matrix for a simple electron-nucleus coupled spin pair subject to weak microwave irradiation, similar to the solid effect. However, unlike the solid effect, RM is optimal when the microwave field is on-resonance and involves the mixing of states by the microwave field together with the electron-nuclear coupling. We argue that this mechanism is responsible for the observed dispersive-shaped DNP field profile for trityl samples near the electron paramagnetic resonance center.

JOURNAL OF PHYSICAL CHEMISTRY LETTERS (2023)

Add to Collection

Review Chemistry, Multidisciplinary

Y Dynamic Nuclear Polarization for Sensitivity Enhancement in Biomolecular Solid-State NMR

Thomas Biedenbaender et al.

Summary: This review summarizes the development and application of dynamic nuclear polarization (DNP) in biomolecular solid-state NMR, especially in studies under fast MAS and high magnetic field, as well as the DNP mechanisms, polarizing agents, and sample constitution methods. Biomolecular NMR has a wide range of applications in areas such as membrane proteins, amyloid fibrils, large biomolecular assemblies, and biomaterials.

CHEMICAL REVIEWS (2022)

Add to Collection

Article Chemistry, Multidisciplinary

Efficient Pulsed Dynamic Nuclear Polarization with the X-Inverse-X Sequence

Venkata SubbaRao Redrouthu et al.

Summary: Pulsed dynamic nuclear polarization (DNP) is a promising approach to enhance the sensitivity of high-resolution magic-angle spinning (MAS) NMR. A new DNP pulse sequence, XiX DNP, has been introduced with a faster transfer of polarization from electrons to H-1, resulting in a 2-fold higher gain in sensitivity compared to existing sequences.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2022)

Add to Collection

Article Multidisciplinary Sciences

1H detection and dynamic nuclear polarization-enhanced NMR of Aβ1-42 fibrils

Salima Bahri et al.

Summary: Magic-angle spinning (MAS) NMR spectroscopy has been widely used to study the high-resolution structures of amyloid-beta (A beta) and other fibrils, but it suffers from low sensitivity. In this study, the drawbacks of MAS NMR were overcome by using two relatively recent techniques: H-1 detection and dynamic nuclear polarization (DNP). The results showed improved sensitivity and allowed for nearly complete resonance assignment and structural analysis of A beta fibrils.

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA (2022)

Add to Collection

Article Multidisciplinary Sciences

Designing broadband pulsed dynamic nuclear polarization sequences in static solids

Nino Wili et al.

Summary: Dynamic nuclear polarization (DNP) is a technique that transfers thermal polarization from unpaired electrons to NMR-active nuclei via microwave irradiation. This study presents novel design principles based on single-spin vector effective Hamiltonian theory for developing new broadband DNP pulse sequences and demonstrates their effectiveness.

SCIENCE ADVANCES (2022)

Add to Collection

Article Chemistry, Physical

Large Room Temperature Bulk DNP of 13C via P1 Centers in Diamond

Daphna Shimon et al.

Summary: In this study, we achieved hyperpolarization of 13C nuclei in diamond at room temperature using microwave-induced dynamic nuclear polarization (DNP) technique, with enhancements of over 100-fold and improvement in signal averaging of the 1% abundant 13C spins by over 10,000-fold. Different enhancement features were observed for the central and outer nuclear spin manifolds, and frequency-chirped millimeter-wave excitation was found to improve the enhancements for the outer spin manifolds. The findings of this study have implications for spectroscopic studies with better chemical shift resolution at room temperature.

JOURNAL OF PHYSICAL CHEMISTRY C (2022)

Add to Collection

Article Chemistry, Multidisciplinary

Overhauser Dynamic Nuclear Polarization with Selectively Deuterated BDPA Radicals

Leo Delage-Laurin et al.

Summary: In this study, the role of hyperfine couplings in BDPA radicals was investigated using EPR and DNP measurements. The results demonstrate that deuterating the fluorene moieties can change the polarity enhancement of the Overhauser effect.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2021)

Add to Collection

Article Chemistry, Physical

Crossover from a Solid Effect to Thermal Mixing 1H Dynamic Nuclear Polarization with Trityl-OX063

Asif Equbal et al.

JOURNAL OF PHYSICAL CHEMISTRY LETTERS (2020)

Add to Collection

Article Chemistry, Multidisciplinary

Water-soluble BDPA radicals with improved persistence

Sucharita Mandal et al.

CHEMICAL COMMUNICATIONS (2020)

Add to Collection

Article Chemistry, Physical

Efficient 263 GHz magic angle spinning DNP at 100 K using solid-state diode sources

Ivan V. Sergeyev et al.

SOLID STATE NUCLEAR MAGNETIC RESONANCE (2019)

Add to Collection

Article Chemistry, Physical

Recent developments in MAS DNP-NMR of materials

Andrew G. M. Rankin et al.

SOLID STATE NUCLEAR MAGNETIC RESONANCE (2019)

Add to Collection

Article Biochemical Research Methods

Frequency-chirped dynamic nuclear polarization with magic angle spinning using a frequency-agile gyrotron

Chukun Gao et al.

JOURNAL OF MAGNETIC RESONANCE (2019)

Add to Collection

Article Chemistry, Physical

Pulse-Shaped Dynamic Nuclear Polarization under Magic-Angle Spinning

Asif Equbal et al.

JOURNAL OF PHYSICAL CHEMISTRY LETTERS (2019)

Add to Collection

Article Multidisciplinary Sciences

Time-optimized pulsed dynamic nuclear polarization

Kong Ooi Tan et al.

SCIENCE ADVANCES (2019)

Add to Collection

Article Biochemical Research Methods

Frequency-agile gyrotron for electron decoupling and pulsed dynamic nuclear polarization

Faith J. Scott et al.

JOURNAL OF MAGNETIC RESONANCE (2018)

Add to Collection

Article Chemistry, Physical

Amplification of Dynamic Nuclear Polarization at 200 GHz by Arbitrary Pulse Shaping of the Electron Spin Saturation Profile

Ilia Kaminker et al.

JOURNAL OF PHYSICAL CHEMISTRY LETTERS (2018)

Add to Collection

Article Multidisciplinary Sciences

High-power sub-terahertz source with a record frequency stability at up to 1 Hz

Andrey Fokin et al.

SCIENTIFIC REPORTS (2018)

Add to Collection

Article Chemistry, Physical

High-frequency pulsed electron-electron double resonance spectroscopy on DNA duplexes using trityl tags and shaped microwave pulses

A. Kuzhelev et al.

PHYSICAL CHEMISTRY CHEMICAL PHYSICS (2018)

Add to Collection

Article Biochemical Research Methods

Arbitrary waveform modulated pulse EPR at 200 GHz

Ilia Kaminker et al.

JOURNAL OF MAGNETIC RESONANCE (2017)

Add to Collection

Review Chemistry, Physical

Dynamic nuclear polarization for sensitivity enhancement in modern solid-state NMR

Aany Sofia Lilly Thankamony et al.

PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY (2017)

Add to Collection

Article Biochemistry & Molecular Biology

NMR-based structural biology enhanced by dynamic nuclear polarization at high magnetic field

Eline J. Koers et al.

JOURNAL OF BIOMOLECULAR NMR (2014)

Add to Collection

Article Chemistry, Physical

Overhauser effects in insulating solids

T. V. Can et al.

JOURNAL OF CHEMICAL PHYSICS (2014)

Add to Collection

Article Chemistry, Multidisciplinary

Highly Efficient, Water-Soluble Polarizing Agents for Dynamic Nuclear Polarization at High Frequency

Claire Sauvee et al.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2013)

Add to Collection

Article Chemistry, Physical

Observation of strongly forbidden solid effect dynamic nuclear polarization transitions via electron-electron double resonance detected NMR

Albert A. Smith et al.

JOURNAL OF CHEMICAL PHYSICS (2013)

Add to Collection

Article Chemistry, Physical

Solid effect dynamic nuclear polarization and polarization pathways

Albert A. Smith et al.

JOURNAL OF CHEMICAL PHYSICS (2012)

Add to Collection

Article Chemistry, Physical

Solid effect in magic angle spinning dynamic nuclear polarization

Bjoern Corzilius et al.

JOURNAL OF CHEMICAL PHYSICS (2012)

Add to Collection

Article Chemistry, Physical

Theory for cross effect dynamic nuclear polarization under magic-angle spinning in solid state nuclear magnetic resonance: The importance of level crossings

Kent R. Thurber et al.

JOURNAL OF CHEMICAL PHYSICS (2012)

Add to Collection

Article Biochemical Research Methods

A 140 GHz pulsed EPR/212 MHz NMR spectrometer for DNP studies

Albert A. Smith et al.

JOURNAL OF MAGNETIC RESONANCE (2012)

Add to Collection

Article Biochemical Research Methods

A 250 GHz gyrotron with a 3 GHz tuning bandwidth for dynamic nuclear polarization

Alexander B. Barnes et al.

JOURNAL OF MAGNETIC RESONANCE (2012)

Add to Collection

Article Chemistry, Multidisciplinary

Water-Soluble Narrow-Line Radicals for Dynamic Nuclear Polarization

Olesya Haze et al.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2012)

Add to Collection

Article Chemistry, Physical

Quantum mechanical theory of dynamic nuclear polarization in solid dielectrics

Kan-Nian Hu et al.

JOURNAL OF CHEMICAL PHYSICS (2011)

Add to Collection

Article Chemistry, Organic

Synthesis of a Water-Soluble 1,3-Bis(diphenylene)2-phenylallyl Radical

Eric L. Dane et al.

JOURNAL OF ORGANIC CHEMISTRY (2010)

Add to Collection

Article Chemistry, Physical

High-frequency dynamic nuclear polarization using biradicals: A multifrequency EPR lineshape analysis

Kan-Nian Hu et al.

JOURNAL OF CHEMICAL PHYSICS (2008)

Add to Collection

Article Physics, Fluids & Plasmas

Spectral characteristics of a 140-GHz long-pulsed gyrotron

Seong-Tae Han et al.

IEEE TRANSACTIONS ON PLASMA SCIENCE (2007)

Add to Collection

Article Chemistry, Physical

High-frequency dynamic nuclear polarization using mixtures of TEMPO and trityl radicals

Kan-Nian Hu et al.

JOURNAL OF CHEMICAL PHYSICS (2007)

Add to Collection

Article Chemistry, Multidisciplinary

Dynamic nuclear polarization of amyloidogenic peptide nanocrystals: GNNQQNY, a core segment of the yeast prion protein Sup35p

Patrick C. A. van der Wel et al.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2006)

Add to Collection

Article Chemistry, Multidisciplinary

Dynamic nuclear polarization with biradicals

KN Hu et al.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2004)

Add to Collection

© Peeref 2019-2024. All rights reserved.