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Atomic Nuclei: Nuclear Spin State Overview

Atomic Nuclei: Nuclear Spin State Overview

NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...

Atomic Nuclei: Nuclear Spin State Population Distribution

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Atomic Nuclei: Nuclear Relaxation Processes

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Atomic Nuclei: Nuclear Spin

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Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR

Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR

Published on: February 23, 2016

Effect of electron spin dynamics on solid-state dynamic nuclear polarization performance.

Ting Ann Siaw¹, Matthias Fehr, Alicia Lund

¹Department of Chemical Engineering, University of California Santa Barbara, Santa Barbara, CA 93106, USA. songi@chem.ucsb.edu.

Physical Chemistry Chemical Physics : PCCP

|June 27, 2014

Summary

This summary is machine-generated.

Generic mono-nitroxide radicals can achieve solid-state dynamic nuclear polarization (ssDNP) comparable to bi-radicals at low temperatures. This finding expands the use of ssDNP for material characterization by optimizing experimental conditions.

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Area of Science:

Solid-state dynamic nuclear polarization (ssDNP)
Nuclear Magnetic Resonance (NMR) spectroscopy
Material characterization

Background:

Solid-state dynamic nuclear polarization (ssDNP) enhanced NMR is a powerful tool for material characterization.
Broad adoption requires the use of generic mono-nitroxide radicals as spin probes.
Understanding ssDNP efficiency factors is crucial for optimizing experimental conditions.

Purpose of the Study:

To advance the mechanistic understanding of ssDNP at liquid helium temperatures (4-40 K).
To investigate the effect of electron spin dynamics on ssDNP performance.
To determine the factors influencing the efficiency of mono- and bi-radicals as spin probes.

Main Methods:

Examined ssDNP performance at liquid helium temperatures (4-40 K) and 7 T.
Analyzed nuclear spin polarization (Pn) and signal buildup time as a function of electron spin relaxation rates.
Modulated electron spin relaxation rates by varying mono- and bi-radical spin concentrations.

Main Results:

Mono- and bi-radicals yielded comparable nuclear spin polarization at 4 K and 7 T, contrasting with higher temperatures.
Observed maximum Pn at intermediate spin concentrations for both radical types.
Demonstrated that comparable polarization arises from a similar integral EPR saturation factor.

Conclusions:

Generic mono-nitroxide probes can achieve competitive ssDNP performance to custom bi-radicals at low temperatures.
Mechanistic insights rationalize ssDNP performance based on electron spin dynamics and radical concentration.
This expands the application scope of ssDNP for studying functional materials and solids.