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Arbitrary waveform modulated pulse EPR at 200GHz.

Ilia Kaminker1, Ryan Barnes1, Songi Han2

  • 1Department of Chemistry and Biochemistry, University of California Santa Barbara, CA, 93106, United States.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|May 9, 2017
PubMed
Summary
This summary is machine-generated.

We integrated arbitrary waveform generation for Electron Paramagnetic Resonance (EPR) and Dynamic Nuclear Polarization (DNP) at 200GHz. Phase-modulated pulses significantly improved broadband spin manipulation and echo intensity.

Keywords:
200GHz EPRAWGArbitrary waveform generatorBroadband pulsesChirp pulsesDNP hardwareEPR hardwareHigh field EPRPhase modulated pulses

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Area of Science:

  • Magnetic Resonance Spectroscopy
  • Quantum Control

Background:

  • Electron Paramagnetic Resonance (EPR) and Dynamic Nuclear Polarization (DNP) are powerful techniques for studying molecular systems.
  • High-frequency microwave control is crucial for advanced EPR and DNP experiments.

Purpose of the Study:

  • To implement arbitrary waveform generation (AWG) capabilities at approximately 200GHz for an EPR/DNP instrument.
  • To enhance spin manipulation capabilities in broadband EPR and DNP experiments.

Main Methods:

  • Integration of a 1GHz, 2-channel digital-to-analog converter (DAC) board into a 7T EPR/DNP platform.
  • Utilizing a solid-state amplifier multiplier chain (AMC) to generate 200GHz waveforms.
  • Generation of phase- and amplitude-modulated waveforms.

Main Results:

  • Successful generation of arbitrary phase- and amplitude-modulated waveforms at 200GHz with >150mW power.
  • Demonstrated significant challenges with amplitude modulation due to AMC non-linearity.
  • Phase-modulated pulses achieved a tenfold improvement in inversion bandwidth and a twofold increase in refocused echo intensity.

Conclusions:

  • Arbitrary waveform generation at 200GHz is feasible for EPR and DNP.
  • Phase-modulated pulses offer superior broadband spin manipulation in power-limited regimes.
  • The developed AWG capabilities enable advanced coherent and incoherent spin manipulations at high frequencies.