Dynamic Nuclear Polarization Studies of TANOL/water-glycerol Solutions

2000 ◽  
Vol 55 (8) ◽  
pp. 682-686 ◽  
Author(s):  
İsmail Sert ◽  
M. Maral Sünnetçioǧlu ◽  
Rıza Sungur ◽  
Gökçe Bingöl
Keyword(s):  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Relaxation Times ◽  
Electronic Relaxation ◽  
Coupling Constant ◽  
Constant Concentration ◽  
Low Field ◽  
Leakage Factor ◽  
Water Glycerol ◽  
Polarization Studies

Abstract Dynamic Nuclear Polarization (DNP) studies of TANOL/water-glycerol solutions were per-formed at 1.53 mT. The samples have either various water-glycerol ratios at constant concentration or various concentrations at a constant water-glycerol ratio. The low field EPR spectra were recorded, the DNP parameters(enhancement factors, coupling constant, leakage factor) were determined, electronic relaxation times were measured. Depending on the values obtained, the interactions between nuclei and electrons are discussed.

Kernrelaxation und Molekülbewegungen in Lösungen freier Radikale

1966 ◽  
Vol 21 (11) ◽  
pp. 1849-1856
Author(s):  
W. Müller-Warmuth ◽  
V. Printz
Keyword(s):  
Free Radicals ◽  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Relaxation Times ◽  
Translational Diffusion ◽  
Nuclear Relaxation ◽  
Correlation Times ◽  
Temperature Dependences ◽  
Polarization Studies ◽  
Excellent Tool

The frequency- and temperature-dependences of the nuclear relaxation times have been studied in several solutions of free radicals. Whilst the major contribution to the relaxation is in most systems from dipolar nuclear-electron coupling modulated by translational diffusion, rotational tumbling of solvent-radical complexes is more effective in solutions of water. The work confirms former conclusions from dynamic nuclear polarization studies. Moreover the validity of the STOKES-EINSTEIN formula is tested which is an excellent tool for the calculation of correlation times.

Low Field (10 mT) Pulsed Dynamic Nuclear Polarization

1999 ◽  
Vol 138 (2) ◽  
pp. 313-319 ◽  
Author(s):  
Marcello Alecci ◽  
David J. Lurie
Keyword(s):  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Low Field

scholarly journals Scavenging Free Radicals To Preserve Enhancement and Extend Relaxation Times in NMR using Dynamic Nuclear Polarization

2010 ◽  
Vol 49 (35) ◽  
pp. 6182-6185 ◽  
Author(s):  
Pascal Miéville ◽  
Puneet Ahuja ◽  
Riddhiman Sarkar ◽  
Sami Jannin ◽  
Paul R. Vasos ◽  
...  
Keyword(s):  
Free Radicals ◽  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Relaxation Times
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