Preprints
https://doi.org/10.5194/mr-2024-8
https://doi.org/10.5194/mr-2024-8
07 May 2024
 | 07 May 2024
Status: a revised version of this preprint is currently under review for the journal MR.

Design and performance of an oversized-sample 35 GHz EPR resonator with an elevated Q value

Jörg Wolfram Anselm Fischer, Julian Stropp, René Tschaggelar, Oliver Oberhänsli, Nicholas Alaniva, Mariko Inoue, Kazushi Mashima, Alexander Benjamin Barnes, Gunnar Jeschke, and Daniel Klose

Abstract. Continuous wave EPR spectroscopy at 35 GHz is an essential cornerstone in multi-frequency EPR studies and crucial for differentiating multiple species in complex systems due to the improved g tensor resolution compared to lower microwave frequencies. Especially for unstable and highly sensitive paramagnetic centers the reliability of the measurements can be improved by the use of a single sample for EPR experiments at all frequencies. Besides the advantages, the lack of common availability of oversized-sample resonators at 35 GHz often limits scientists to lower frequencies or smaller sample geometries, the latter may be non-trivial for sensitive materials. In this work, we present the design and performance of an oversized-sample 35 GHz EPR resonator with a high loaded Q value up to 3300 well suited for continuous wave EPR and single microwave frequency experiments with low excitation power. The design is driven by electromagnetic field simulations and the microwave characteristics of manufactured prototypes were found in agreement with the predictions. The resonator is based on a cylindrical cavity with a TE011 mode allowing for 3 mm sample access. Design targets met comprise high sensitivity, robustness, ease of manufacturing and maintenance. The resonator is compatible with commercial EPR spectrometers and cryostats, allowing for measurements at temperatures down to at least 4 K. To highlight the general applicability, the resonator was tested on metal centers as well as on organic radicals featuring extremely narrow lines.

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.
Jörg Wolfram Anselm Fischer, Julian Stropp, René Tschaggelar, Oliver Oberhänsli, Nicholas Alaniva, Mariko Inoue, Kazushi Mashima, Alexander Benjamin Barnes, Gunnar Jeschke, and Daniel Klose

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on mr-2024-8', Anonymous Referee #1, 09 May 2024
    • AC1: 'Reply on RC1', Daniel Klose, 16 May 2024
  • RC2: 'Comment on mr-2024-8', Anonymous Referee #2, 31 May 2024
    • AC2: 'Reply on RC2', Daniel Klose, 06 Jun 2024
Jörg Wolfram Anselm Fischer, Julian Stropp, René Tschaggelar, Oliver Oberhänsli, Nicholas Alaniva, Mariko Inoue, Kazushi Mashima, Alexander Benjamin Barnes, Gunnar Jeschke, and Daniel Klose

Data sets

Design 3D CAD data of an oversized-sample 35 GHz EPR resonator with an elevated Q value Jörg Wolfram Anselm Fischer, Julian Stropp, René Tschaggelar, Oliver Oberhänsli, Nicholas Alaniva, Mariko Inoue, Kazushi Mashima, Alexander Benjamin Barnes, Gunnar Jeschke, and Daniel Klose https://doi.org/10.5281/zenodo.11082486

Jörg Wolfram Anselm Fischer, Julian Stropp, René Tschaggelar, Oliver Oberhänsli, Nicholas Alaniva, Mariko Inoue, Kazushi Mashima, Alexander Benjamin Barnes, Gunnar Jeschke, and Daniel Klose

Viewed

Total article views: 510 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
388 101 21 510 51 11 10
  • HTML: 388
  • PDF: 101
  • XML: 21
  • Total: 510
  • Supplement: 51
  • BibTeX: 11
  • EndNote: 10
Views and downloads (calculated since 07 May 2024)
Cumulative views and downloads (calculated since 07 May 2024)

Viewed (geographical distribution)

Total article views: 452 (including HTML, PDF, and XML) Thereof 452 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 22 Jul 2024
Download
Short summary
This paper shows the design, simulations and experimental performance of a 35 GHz 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 for 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.