Frequency-agile gyrotron for electron decoupling and pulsed dynamic nuclear polarization

Journal of Magnetic Resonance
Faith J ScottAlexander B Barnes

Abstract

We describe a frequency-agile gyrotron which can generate frequency-chirped microwave pulses. An arbitrary waveform generator (AWG) within the NMR spectrometer controls the microwave frequency, enabling synchronized pulsed control of both electron and nuclear spins. We demonstrate that the acceleration of emitted electrons, and thus the microwave frequency, can be quickly changed by varying the anode voltage. This strategy results in much faster frequency response than can be achieved by changing the potential of the electron emitter, and does not require a custom triode electron gun. The gyrotron frequency can be swept with a rate of 20 MHz/μs over a 670 MHz bandwidth in a static magnetic field. We have already implemented time-domain electron decoupling with dynamic nuclear polarization (DNP) magic angle spinning (MAS) with this device. In this contribution, we show frequency-swept DNP enhancement profiles recorded without changing the NMR magnet or probe. The profile of endofullerenes exhibits a DNP profile with a <10 MHz linewidth, indicating that the device also has sufficient frequency stability, and therefore phase stability, to implement pulsed DNP mechanisms such as the frequency-swept solid effect. We describe schemat...Continue Reading

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Citations

Apr 13, 2018·Physical Chemistry Chemical Physics : PCCP·Johannes J WittmannBjörn Corzilius
Sep 23, 2019·The Journal of Chemical Physics·Edward P Saliba, Alexander B Barnes
Feb 20, 2020·Annual Review of Physical Chemistry·Björn Corzilius
Jul 23, 2019·Journal of Magnetic Resonance·Robert G GriffinRichard J Temkin
Aug 5, 2018·Journal of Magnetic Resonance·Erika L SestiAlexander B Barnes
Apr 13, 2019·Journal of Magnetic Resonance·Chukun GaoAlexander B Barnes
Sep 6, 2018·The Journal of Physical Chemistry Letters·Edward P SalibaAlexander B Barnes
Feb 23, 2020·The Journal of Physical Chemistry. B·Patrick T JudgeAlexander B Barnes
Jul 28, 2019·The Journal of Physical Chemistry Letters·Scott L CarnahanAaron J Rossini
Nov 24, 2021·Journal of the American Chemical Society·Léo Delage-LaurinRobert G Griffin

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