Arbitrary Waveform Modulated Pulse EPR at 200GHz

Overview

Journal J Magn Reson

Publisher Elsevier

Date 2017 May 9

PMID 28482216

Citations 9

Authors

Ilia Kaminker

Ryan Barnes

Songi Han

Affiliations

Soon will be listed here.

Abstract

We report here on the implementation of arbitrary waveform generation (AWG) capabilities at ∼200GHz into an Electron Paramagnetic Resonance (EPR) and Dynamic Nuclear Polarization (DNP) instrument platform operating at 7T. This is achieved with the integration of a 1GHz, 2 channel, digital to analog converter (DAC) board that enables the generation of coherent arbitrary waveforms at K-band frequencies with 1ns 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 200GHz with >150mW power. We find that the non-linearity of the AMC poses significant difficulties in generating amplitude-modulated pulses at 200GHz. We demonstrate that in the power-limited regime of ω<1MHz phase-modulated pulses were sufficient to achieve significant improvements in broadband (>10MHz) 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 200GHz.

Citing Articles

Frequency-swept dynamic nuclear polarization.

Mardini M, Palani R, Ahmad I, Mandal S, Jawla S, Bryerton E J Magn Reson. 2023; 353:107511.

PMID: 37385067 PMC: 11549732. DOI: 10.1016/j.jmr.2023.107511.

Large Room Temperature Bulk DNP of C via P1 Centers in Diamond.

Shimon D, Cantwell K, Joseph L, Williams E, Peng Z, Takahashi S J Phys Chem C Nanomater Interfaces. 2022; 126(41):17777-17787.

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Phase stable, shot-to-shot measurement of third- and fifth-order two-quantum correlation spectra using a pulse shaper in the pump-probe geometry.

Farrell K, Zanni M J Chem Phys. 2022; 157(1):014203.

PMID: 35803806 PMC: 9262413. DOI: 10.1063/5.0097019.

Electron spin density matching for cross-effect dynamic nuclear polarization.

Li Y, Equbal A, Tagami K, Han S Chem Commun (Camb). 2019; 55(53):7591-7594.

PMID: 31165810 PMC: 6597276. DOI: 10.1039/c9cc03499d.

Conformational tuning of a DNA-bound transcription factor.

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