Improving B1 field homogeneity in dielectric tube resonators for EPR spectroscopy via controlled shaping of the dielectric insert

Victoria N. Syryamina, Anna G. Matveeva, Yan V. Vasiliev, Anton Savitsky, Yuri A. Grishin

Research output: Contribution to journalArticlepeer-review

Abstract

We propose an approach for improving the homogeneity of microwave magnetic field amplitude in a dielectric tube resonator for electron paramagnetic resonance spectroscopy at X-band. The improvement is achieved by “shaping” (controllable variation of the outer diameter of a dielectric insert along its axial direction). Various shaping scenarios based on the principle of discrete solenoids and electromagnetic calculations have been considered. The dielectric insert having the most promising shape was manufactured from a bismuth germanate single crystal. The shaped insert increases the area at B1 > 0.9 B1max from 5.06 to 7.36 mm. Higher sensitivity and lower likelihood of quantitative errors have been achieved in pulse EPR experiments for “long” samples (whose length was comparable to that of the dielectric insert) in a shaped dielectric insert.

Original languageEnglish
Article number106685
Number of pages11
JournalJournal of Magnetic Resonance
Volume311
DOIs
Publication statusPublished - Feb 2020

Keywords

  • Dielectric resonator
  • EPR
  • Homogeneity of microwave magnetic field amplitude
  • SIGNAL
  • BGO CRYSTALS
  • MODEL
  • ENVELOPE MODULATION
  • ELECTRON-SPIN ECHO
  • FREE-RADICALS
  • ELDOR
  • RESONANCE
  • HYPERFINE
  • PULSED ELECTRON

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