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Rutile dielectric loop-gap resonator for X-band EPR spectroscopy of small aqueous samples.

Authors
  • Mett, Richard R1
  • Sidabras, Jason W2
  • Anderson, James R2
  • Klug, Candice S2
  • Hyde, James S2
  • 1 National Biomedical EPR Center, Department of Biophysics, Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, WI 53226, USA; Department of Physics and Chemistry, Milwaukee School of Engineering, 1025 North Broadway, Milwaukee, WI 53202, USA. Electronic address: [email protected]
  • 2 National Biomedical EPR Center, Department of Biophysics, Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, WI 53226, USA.
Type
Published Article
Journal
Journal of Magnetic Resonance
Publisher
Elsevier
Publication Date
Oct 01, 2019
Volume
307
Pages
106585–106585
Identifiers
DOI: 10.1016/j.jmr.2019.106585
PMID: 31499469
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

The performance of a metallic microwave resonator that contains a dielectric depends on the separation between metallic and dielectric surfaces, which affects radio frequency currents, evanescent waves, and polarization charges. The problem has previously been discussed for an X-band TE011 cylindrical cavity resonator that contains an axial dielectric tube (Hyde and Mett, 2017). Here, a short rutile dielectric tube inserted into a loop-gap resonator (LGR) at X-band, which is called a dielectric LGR (dLGR), is considered. The theory is developed and experimental results are presented. It was found that a central sample loop surrounded by four "flux-return" loops (i.e., 5-loop-4-gap) is preferable to a 3-loop-2-gap configuration. For sufficiently small samples (less than 1 µL), a rutile dLGR is preferred relative to an LGR both at constant Λ (B1/Pl) and at constant incident power. Introduction of LGR technology to X-band EPR was a significant advance for site-directed spin labeling because of small sample size and high Λ. The rutile dLGR introduced in this work offers further extension to samples that can be as small as 50 nL when using typical EPR acquisition times. Copyright © 2019 Elsevier Inc. All rights reserved.

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