Dear All,
We are excited to announce the Global NMR Tutorials Session in Spring 2023. We have an amazing list of speakers.
- Quentin Stern Chappuis (Jan 10)
- Marcel Utz (Jan 24)
- Giulia Mollica (Feb 7)
- Elena Vinogradov (Feb 21)
- Rob Schurko (March 7)
- Leonard J. Mueller (March 21)
- Christophe Copéret (April 4)
- Nobuhiro Yanai (May 2)
- Laura Castañar Acedo (May 16)
- Jan Stanek (May 30)
- Dominik Bucher (June 13)
The 58th Global NMR Educational Tutorial will be given by Dr. Quentin Stern Chappuis, Postdoc, from Sami Janin’s lab, France on the topic:
“The surprising consequences of near unity electron spin polarization”
Abstract:
The inherent low sensitivity of NMR can be overcome by hyperpolarization techniques, which increase the polarization of nuclear spins far beyond the Boltzmann equilibrium. One such method is dynamic nuclear polarization (DNP), which consists of transferring the high polarization of unpaired electron spins to surrounding nuclear spins via microwave irradiation. In the case of dissolution DNP (dDNP), the sample is hyperpolarized in the solid state at low temperature (1-2 K) and moderate magnetic field (3-7 T), where the Boltzmann polarization of electron spins approaches unity, translating into equally high nuclear polarization under DNP. In addition to yielding high nuclear polarization, the high electron polarization has other interesting consequences for NMR. Indeed, as the electron polarization tends towards unity, the electron flip-flop probability vanishes, an effect sometimes referred to as “bath quenching”. By switching on and off microwave irradiation (microwave gating), one switches on and off electron flip-flops and hence paramagnetic relaxation. This has been shown to have a dramatic effect on transverse nuclear relaxation and on nuclear spin diffusion. In this talk, I will review the basic concepts of paramagnetic relaxation and its dependence on electron polarization. I will then present experiments where we used microwave gating to perform efficient CP, to detect EPR properties indirectly via NMR properties, and finally to study nuclear spin diffusion in the vicinity of electron spins.
Webinar details:
Time: Tuesday, January 10, 2022, 8:00 AM California or 11:00 AM Boston or 5:00 PM Paris or 9:30 PM Delhi
New Link: https://epfl.zoom.us/j/81308524368
We have updated our upcoming events on our website “www.globalnmr.org”. Please sign up for talk notifications so you don’t miss any.
Best regards,
Global NMR Discussion Meetings
YouTube: https://www.youtube.com/c/GlobalNMRDiscussionMeetings/videos
Current organizers:
Adrian Draney (Creighton Uni., Chemistry)
Amrit Venkatesh (Lyndon Emsley Lab, EPFL)
Asif Equbal (New York Uni., Abu Dhabi)
Blake Wilson (Robert Tycko Lab, NIH)
Michael Hope (Lyndon Emsley Lab, EPFL)
Mouzhe Xie (Maurer Lab, Uni. Chicago)
Nino Wili (Niels Chr Nielsen Lab, Aarhus Uni.)
Tamar Wolf (Lucio Frydman Lab, Weizmann Institute of Science)
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