Broadband Fourier-Transform-Detected EPR at W-Band

Subramanya, Manoj Vinayaka Hanabe; Marbey, Jonathan; Kundu, Krishnendu; McKay, Johannes E.; Hill, Stephen

doi:10.1007/s00723-022-01499-3

Title: Broadband Fourier-Transform-Detected EPR at W-Band

Journal Article · Sat Sep 24 00:00:00 EDT 2022 · Applied Magnetic Resonance

DOI:https://doi.org/10.1007/s00723-022-01499-3· OSTI ID:1957940

Subramanya, Manoj Vinayaka Hanabe ^[1]; Marbey, Jonathan ^[1]; Kundu, Krishnendu ^[2]; McKay, Johannes E. ^[3]; Hill, Stephen ^[1]

National High Magnetic Field Lab., Tallahassee, FL (United States); Florida State Univ., Tallahassee, FL (United States)
National High Magnetic Field Lab., Tallahassee, FL (United States)
National High Magnetic Field Lab., Tallahassee, FL (United States); Univ. of Maryland, College Park, MD (United States)

This manuscript reports development of wideband Fourier transform (FT) electron paramagnetic resonance (EPR) detection capability at the uniquely high frequency of 94 GHz. Here, this technique is based on the HiPER spectrometer developed at the University of St. Andrews, into which we have integrated an arbitrary waveform generator (AWG) that is used to modulate the output from a solid-state multiplier chain prior to amplification, generating up to 1 kW microwave power with 1 GHz bandwidth. Benchmark experiments are presented for a standard TEMPOL radical, which comprises a 500 MHz broad EPR spectrum at 94 GHz. Using a single frequency-swept microwave pulse, efficient inversion of this spectrum is demonstrated, enabling frequency-dependent studies of the magnetization relaxation in the time-domain, again via broadband echo detection. From these measurements, an anisotropy in the spin–lattice relaxation time, T₁, can be determined with ease for TEMPOL. In addition, we implement the FT detection scheme for multi-dimensional (electron–electron double resonance, or ELDOR) experiments, demonstrating the full capabilities of the HiPER spectrometer. As an example, we present FT-detected version of the ELDOR-detected nuclear magnetic resonance technique for the TEMPOL radical. We also describe potential applications of the new instrumentation for studies of gadolinium qubits.

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Research Organization:: Florida State Univ., Tallahassee, FL (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0020260

OSTI ID:: 1957940

Journal Information:: Applied Magnetic Resonance, Vol. 54, Issue 1; ISSN 0937-9347

Publisher:: Springer NatureCopyright Statement

Country of Publication:: United States

Language:: English

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