Arbitrary waveform modulated pulse EPR at 200 GHz

Ilia Kaminker, Ryan Barnes, Songi Han*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We report here on the implementation of arbitrary waveform generation (AWG) capabilities at ∼200 GHz into an Electron Paramagnetic Resonance (EPR) and Dynamic Nuclear Polarization (DNP) instrument platform operating at 7 T. This is achieved with the integration of a 1 GHz, 2 channel, digital to analog converter (DAC) board that enables the generation of coherent arbitrary waveforms at Ku-band frequencies with 1 ns resolution into an existing architecture of a solid state amplifier multiplier chain (AMC). This allows for the generation of arbitrary phase- and amplitude-modulated waveforms at 200 GHz with >150 mW power. We find that the non-linearity of the AMC poses significant difficulties in generating amplitude-modulated pulses at 200 GHz. We demonstrate that in the power-limited regime of ω1 < 1 MHz phase-modulated pulses were sufficient to achieve significant improvements in broadband (>10 MHz) spin manipulation in incoherent (inversion), as well as coherent (echo formation) experiments. Highlights include the improvement by one order of magnitude in inversion bandwidth compared to that of conventional rectangular pulses, as well as a factor of two in improvement in the refocused echo intensity at 200 GHz.

Original languageEnglish
Pages (from-to)81-90
Number of pages10
JournalJournal of Magnetic Resonance
Volume279
DOIs
StatePublished - 1 Jun 2017
Externally publishedYes

Funding

FundersFunder number
National Science FoundationCHE #1505038
National Institutes of Health
National Institute of Biomedical Imaging and BioengineeringR21EB022731
Ohsumi Frontier Science Foundation

    Keywords

    • 200 GHz EPR
    • AWG
    • Arbitrary waveform generator
    • Broadband pulses
    • Chirp pulses
    • DNP hardware
    • EPR hardware
    • High field EPR
    • Phase modulated pulses

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