Publikation:

Continuous-wave EPR at 275GHz : application to high-spin Fe3+ systems

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2011

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Blok, Herman
Disselhorst, Jos A. J. M.
Gast, Peter
van der Meer, Harmen
Miedema, Daniel M.
Almeida, Rui M.
Moura, José J. G.
Hagen, Wilfred R.
Groenen, Edgar J. J.

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https://doi.org/10.1016/j.jmr.2011.03.009
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Chemie: Publikationen
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Journal of Magnetic Resonance : JMR. 2011, 210(1), pp. 126-132. ISSN 1090-7807. eISSN 1096-0856. Available under: doi: 10.1016/j.jmr.2011.03.009

Zusammenfassung

The 275GHz electron-paramagnetic-resonance spectrometer we reported on in 2004 has been equipped with a new probe head, which contains a cavity especially designed for operation in continuous-wave mode. The sensitivity and signal stability that is achieved with this new probe head is illustrated with 275GHz continuous-wave spectra of a 1mM frozen solution of the complex Fe(III)-ethylenediamine tetra-acetic acid and of 10mM frozen solutions of the protein rubredoxin, which contains Fe3+ in its active site, from three different organisms. The high quality of the spectra of the rubredoxins allows the determination of the zero-field-splitting parameters with an accuracy of 0.5GHz. The success of our approach results partially from the enhanced absolute sensitivity, which can be reached using a single-mode cavity. At least as important is the signal stability that we were able to achieve with the new probe head.

Zusammenfassung in einer weiteren Sprache

Fachgebiet (DDC)
540 Chemie

Schlagwörter

EPR, High-field, High-frequency, Continuous-wave, Single-mode cavity, Fe(III)–EDTA, Rubredoxin

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ISO 690MATHIES, Guinevere, Herman BLOK, Jos A. J. M. DISSELHORST, Peter GAST, Harmen VAN DER MEER, Daniel M. MIEDEMA, Rui M. ALMEIDA, José J. G. MOURA, Wilfred R. HAGEN, Edgar J. J. GROENEN, 2011. Continuous-wave EPR at 275GHz : application to high-spin Fe3+ systems. In: Journal of Magnetic Resonance : JMR. 2011, 210(1), pp. 126-132. ISSN 1090-7807. eISSN 1096-0856. Available under: doi: 10.1016/j.jmr.2011.03.009
BibTex
@article{Mathies2011-05Conti-43518,
  year={2011},
  doi={10.1016/j.jmr.2011.03.009},
  title={Continuous-wave EPR at 275GHz : application to high-spin Fe<sup>3+</sup> systems},
  number={1},
  volume={210},
  issn={1090-7807},
  journal={Journal of Magnetic Resonance : JMR},
  pages={126--132},
  author={Mathies, Guinevere and Blok, Herman and Disselhorst, Jos A. J. M. and Gast, Peter and van der Meer, Harmen and Miedema, Daniel M. and Almeida, Rui M. and Moura, José J. G. and Hagen, Wilfred R. and Groenen, Edgar J. J.}
}
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