Time-Resolved CIDNP Investigation of the Cross-Relaxation Mechanism of1H Nuclear Polarization

1996 ◽  
Vol 100 (2) ◽  
pp. 556-564 ◽  
Author(s):  
S. N. Batchelor ◽  
H. Fischer
Keyword(s):  
Nuclear Polarization ◽  
Relaxation Mechanism ◽  
Cross Relaxation ◽  
Time Resolved ◽  
The Cross

Cross-relaxation mechanism for the formation of nuclear polarization: a quantitative time-resolved CIDNP study

1995 ◽  
Vol 246 (4-5) ◽  
pp. 499-505 ◽  
Author(s):  
O.B. Morozova ◽  
Yu.P. Tsentalovich ◽  
A.V. Yurkovskaya ◽  
R.Z. Sagdeev
Keyword(s):  
Nuclear Polarization ◽  
Relaxation Mechanism ◽  
Cross Relaxation ◽  
Time Resolved

scholarly journals Electron self-exchange activation parameters of diethyl sulfide and tetrahydrothiophene

2013 ◽  
Vol 9 ◽  
pp. 1448-1454
Author(s):  
Martin Goez ◽  
Martin Vogtherr
Keyword(s):  
Electron Transfer ◽  
Photoinduced Electron Transfer ◽  
Nuclear Polarization ◽  
Activation Barrier ◽  
Activation Parameters ◽  
Radical Cations ◽  
Free Energies ◽  
Time Resolved ◽  
Diethyl Sulfide ◽  
Chemically Induced

Electron transfer between the title compounds and their radical cations, which were generated by photoinduced electron transfer from the sulfides to excited 2,4,6-triphenylpyrylium cations, was investigated by time-resolved measurements of chemically induced dynamic nuclear polarization (CIDNP) in acetonitrile. The strongly negative activation entropies provide evidence for an associative–dissociative electron exchange involving dimeric radical cations. Despite this mechanistic complication, the free energies of activation were found to be well reproduced by the Marcus theory of electron transfer, with the activation barrier still dominated by solvent reorganization.

Influence of Sensitizer Concentration on the Upconversion Luminescence of NaYF4: Yb3+, Er3+ Nanoparticles

2012 ◽  
Vol 510 ◽  
pp. 609-613 ◽  
Author(s):  
Jun Wei Zhao ◽  
Dong Mei Shi ◽  
Ying Gang Zhao ◽  
Xiang Gui Kong
Keyword(s):  
Room Temperature ◽  
Doping Concentration ◽  
Sodium Citrate ◽  
Upconversion Luminescence ◽  
Green Emission ◽  
Cross Relaxation ◽  
The Cross ◽  
Hydrothermal Methods ◽  
Sensitization Effect

A series of NaYF4: Yb3+, Er3+ nanoparticles with different doping concentration were successfully prepared by the combination of coprecipitation and hydrothermal methods using sodium citrate as chelator. Upconversion luminescence can be observed in all of the samples at room temperature. Fixed the Er3+ concentration with 1 mol% unchanged, the effect of the Yb3+ concentration on the upconversion luminescence of NaYF4: Yb3+, Er3+ samples were studied when the doped Yb3+ concentrations were 0 mol%, 1 mol%, 2 mol%, 5 mol%, 10 mol% and 20 mol%, respectively. As increasing the Yb3+ concentration, the total intensity of the upconversion luminescence of the samples is increasing while the ratio of red to green emission increases firstly and then decreases. The maximum ratio value is 22.1 when the Yb3+ concentration is 10 mol%. It is found that the cross relaxation and cooperative sensitization effect are the reasons for the phenomenon above.

Heteronuclear Cross-Relaxation under Solid-State Dynamic Nuclear Polarization

2016 ◽  
Vol 138 (51) ◽  
pp. 16572-16575 ◽  
Author(s):  
Diane Daube ◽  
Victoria Aladin ◽  
Jörg Heiliger ◽  
Johannes J. Wittmann ◽  
Dominic Barthelmes ◽  
...  
Keyword(s):  
Solid State ◽  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Cross Relaxation ◽  
State Dynamic

Cross-relaxation energy transfer between the Er3+ ions in vitreous arsenic chalcogenide

2019 ◽  
Vol 33 (28) ◽  
pp. 1950348
Author(s):  
S. Q. Asadullayeva ◽  
Q. Y. Eyyubov
Keyword(s):  
Energy Transfer ◽  
Relaxation Process ◽  
Luminescence Intensity ◽  
Near Infrared ◽  
Cross Relaxation ◽  
Relaxation Energy ◽  
Infrared Luminescence ◽  
Cross Relaxation Process ◽  
The Cross ◽  
Activator Ions

In this paper, we study widely investigated photoluminescent properties of [Formula: see text] compounds in the near-infrared ranges. The increase of the infrared luminescence intensity with increasing [Formula: see text] concentration can be attributed to the cross-relaxation process between the activator ions.

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