Articles | Volume 5, issue 2
https://doi.org/10.5194/mr-5-143-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/mr-5-143-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Design and performance of an oversized-sample 35 GHz EPR resonator with an elevated Q value
Jörg Wolfgang Anselm Fischer
Institute for Molecular Physical Science, ETH Zurich, Vladimir-Prelog-Weg 2, 8093 Zurich, Switzerland
Julian Stropp
Institute for Molecular Physical Science, ETH Zurich, Vladimir-Prelog-Weg 2, 8093 Zurich, Switzerland
René Tschaggelar
Institute for Molecular Physical Science, ETH Zurich, Vladimir-Prelog-Weg 2, 8093 Zurich, Switzerland
Oliver Oberhänsli
Institute for Molecular Physical Science, ETH Zurich, Vladimir-Prelog-Weg 2, 8093 Zurich, Switzerland
Nicholas Alaniva
Institute for Molecular Physical Science, ETH Zurich, Vladimir-Prelog-Weg 2, 8093 Zurich, Switzerland
Mariko Inoue
Department of Chemistry Graduate School of Engineering Science, Osaka University, 1–3 Machikaneyama-cho, Toyonaka, Osaka 560-8531, Japan
Kazushi Mashima
Department of Chemistry Graduate School of Engineering Science, Osaka University, 1–3 Machikaneyama-cho, Toyonaka, Osaka 560-8531, Japan
Alexander Benjamin Barnes
Institute for Molecular Physical Science, ETH Zurich, Vladimir-Prelog-Weg 2, 8093 Zurich, Switzerland
Gunnar Jeschke
Institute for Molecular Physical Science, ETH Zurich, Vladimir-Prelog-Weg 2, 8093 Zurich, Switzerland
Daniel Klose
CORRESPONDING AUTHOR
Institute for Molecular Physical Science, ETH Zurich, Vladimir-Prelog-Weg 2, 8093 Zurich, Switzerland
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Julian Stropp, Nino Wili, Niels C. Nielsen, and Daniel Klose
Magn. Reson., 6, 33–42, https://doi.org/10.5194/mr-6-33-2025, https://doi.org/10.5194/mr-6-33-2025, 2025
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Sensitivity is often a limiting factor in electron–nuclear double resonance (ENDOR). Here we demonstrate how using chirp radiofrequency pulses can improve ENDOR sensitivity up to 3–9 fold, with the strongest increase for broader lines often encountered in disordered solids for nuclei such as nitrogen and metals. The resulting drastic speedup in acquisition times also renders 2D ENDOR more feasible, as we demonstrate in TRIPLE, showing correlations with Cu hyperfine couplings.
Lauren E. Price, Nicholas Alaniva, Marthe Millen, Till Epprecht, Michael Urban, Alexander Däpp, and Alexander B. Barnes
Magn. Reson., 4, 231–241, https://doi.org/10.5194/mr-4-231-2023, https://doi.org/10.5194/mr-4-231-2023, 2023
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This paper describes the design and implementation of new technology for nuclear magnetic resonance, which is a technique used to understand the molecular structure and dynamics of many systems. The spherical sample container and its apparatus introduced in this paper are used to perform initial proof-of-principle experiments at cryogenic temperatures. Further development of this technology will facilitate more flexibility in magnetic resonance experiments.
Agathe Vanas, Janne Soetbeer, Frauke Diana Breitgoff, Henrik Hintz, Muhammad Sajid, Yevhen Polyhach, Adelheid Godt, Gunnar Jeschke, Maxim Yulikov, and Daniel Klose
Magn. Reson., 4, 1–18, https://doi.org/10.5194/mr-4-1-2023, https://doi.org/10.5194/mr-4-1-2023, 2023
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Nanometre distance measurements between spin labels by pulse EPR techniques yield structural information on the molecular level. Here, backed by experimental data, we derive a description for the total signal of the single-frequency technique for refocusing dipolar couplings (SIFTER), showing how the different spin–spin interactions give rise to dipolar signal and background – the latter has thus far been unknown.
Nino Wili, Jan Henrik Ardenkjær-Larsen, and Gunnar Jeschke
Magn. Reson., 3, 161–168, https://doi.org/10.5194/mr-3-161-2022, https://doi.org/10.5194/mr-3-161-2022, 2022
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Dynamic nuclear polarisation (DNP) transfers polarisation from electron to nuclear spins. This is usually combined with direct detection of the latter. Here, we show that it is possible to reverse the transfer at 1.2 T. This allows us to investigate the spin dynamics of nuclear spins close to electrons – something that is notoriously difficult with established methods. We expect reverse DNP to be useful in the study of spin diffusion or as a building block for more elaborate pulse sequences.
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Short summary
We show the design, simulations, and experimental performance of a 35 GHz electron paramagnetic resonance (EPR) resonator based on a cylindrical cavity with 3 mm sample access. The design is robust; simple to manufacture and maintain; and, with its elevated Q value, well-suited to sensitive EPR experiments using continuous-wave or low-power pulsed excitation. Thus, we make multi-frequency EPR spectroscopy, a powerful approach to deconvolute overlapping paramagnetic species, more accessible.
We show the design, simulations, and experimental performance of a 35 GHz electron paramagnetic...