scholarly journals Cross polarization from 1H to quadrupolar 6Li nuclei for dissolution DNP

2014 ◽  
Vol 16 (45) ◽  
pp. 24813-24817 ◽  
Author(s):  
Angel J. Perez Linde ◽  
Aurélien Bornet ◽  
Jonas Milani ◽  
Basile Vuichoud ◽  
Roberto Melzi ◽  
...  
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Cross Polarization ◽  
Spin Resonance ◽  
Dissolution Dynamic Nuclear Polarization

With a dedicated probe for dissolution dynamic nuclear polarization (D-DNP), cross polarization from 1H to 6Li can be combined with LOngitudinally Detected Electron Spin Resonance (LODESR) to achieve 6Li polarization levels on the order of 20% in less than 30 min at 1.2 K.

Boosting Dissolution Dynamic Nuclear Polarization by Cross Polarization

2012 ◽  
Vol 4 (1) ◽  
pp. 111-114 ◽  
Author(s):  
Aurélien Bornet ◽  
Roberto Melzi ◽  
Angel J. Perez Linde ◽  
Patrick Hautle ◽  
Ben van den Brandt ◽  
...  
Keyword(s):  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Cross Polarization ◽  
Dissolution Dynamic Nuclear Polarization

scholarly journals Boosting Dissolution-Dynamic Nuclear Polarization by Multiple-Step Dipolar Order Mediated 1H->13C Cross-Polarization

2021 ◽  
Author(s):  
Stuart J. Elliott ◽  
Olivier Cala ◽  
Quentin Chappuis ◽  
Samuel Cousin ◽  
Morgan Ceillier ◽  
...  
Keyword(s):  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Pulse Sequence ◽  
Polarization Transfer ◽  
Cross Polarization ◽  
Spin Order ◽  
Sample Dissolution ◽  
Dipolar Order ◽  
Multiple Step ◽  
Dissolution Dynamic Nuclear Polarization

<p>Dissolution-dynamic nuclear polarization can be boosted by employing multiplecontact cross-polarization techniques to transfer polarization from 1H to 13C spins. The method is efficient and significantly reduces polarization build-up times, however, it involves high-power radiofrequency pulses in a superfluid helium environment which limit its implementation and applicability and prevent a significant scaling-up of the sample size.</p> <p>We propose to overcome this limitation by a stepwise transfer of polarization using a lowenergy and low-peak power radiofrequency pulse sequence where the 1H®13C polarization transfer is mediated by a dipolar spin order reservoir. An experimental demonstration is presented for [1-13C]sodium acetate. A solid-state 13C polarization of ~43.5% was achieved using this method with a build-up time constant of ~5.1 minutes, leading to a ~28.5% 13C polarization in the liquidstate after sample dissolution. The low-power multiple-step polarization transfer efficiency with respect to the most advanced and highest-power multiple-contact cross-polarization approach was found to be ~0.69.</p>

scholarly journals Boosting Dissolution-Dynamic Nuclear Polarization by Multiple-Step Dipolar Order Mediated 1H->13C Cross-Polarization

2021 ◽  
Author(s):  
Stuart J. Elliott ◽  
Olivier Cala ◽  
Quentin Chappuis ◽  
Samuel Cousin ◽  
Morgan Ceillier ◽  
...  
Keyword(s):  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Pulse Sequence ◽  
Polarization Transfer ◽  
Cross Polarization ◽  
Spin Order ◽  
Sample Dissolution ◽  
Dipolar Order ◽  
Multiple Step ◽  
Dissolution Dynamic Nuclear Polarization

<p>Dissolution-dynamic nuclear polarization can be boosted by employing multiplecontact cross-polarization techniques to transfer polarization from 1H to 13C spins. The method is efficient and significantly reduces polarization build-up times, however, it involves high-power radiofrequency pulses in a superfluid helium environment which limit its implementation and applicability and prevent a significant scaling-up of the sample size.</p> <p>We propose to overcome this limitation by a stepwise transfer of polarization using a lowenergy and low-peak power radiofrequency pulse sequence where the 1H®13C polarization transfer is mediated by a dipolar spin order reservoir. An experimental demonstration is presented for [1-13C]sodium acetate. A solid-state 13C polarization of ~43.5% was achieved using this method with a build-up time constant of ~5.1 minutes, leading to a ~28.5% 13C polarization in the liquidstate after sample dissolution. The low-power multiple-step polarization transfer efficiency with respect to the most advanced and highest-power multiple-contact cross-polarization approach was found to be ~0.69.</p>

Cross-polarization for dissolution dynamic nuclear polarization

2014 ◽  
Vol 16 (39) ◽  
pp. 21407-21416 ◽  
Author(s):  
Michael Batel ◽  
Alexander Däpp ◽  
Andreas Hunkeler ◽  
Beat H. Meier ◽  
Sebastian Kozerke ◽  
...  
Keyword(s):  
Dynamic Nuclear Polarization ◽  
Thermodynamic Model ◽  
Nuclear Polarization ◽  
Cross Polarization ◽  
Rf Pulses ◽  
Dissolution Dynamic Nuclear Polarization

Investigation of DNP CP using a spin-thermodynamic model and optimization of CP in power-limited DNP probes using adiabatic RF pulses.

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