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Force-detected ESR Measurements in a Terahertz Range up to 0.5 THz and Application to Hemin

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An Erratum to this article was published on 18 April 2017

Abstract

We report a novel force-detected high-frequency electron spin resonance (HFESR) technique using a microcantilever in the terahertz region. In this technique, we attach a tiny sample on the microcantilever end and the ESR signal is detected as the cantilever bending. The bending is sensitively detected by fiber-optic Fabry–Perot interferometry. We applied this technique to a tiny amount (~16 ng) of metalloporphyrin, a model substance of hemoproteins, and successfully observed ESR signals at multiple frequencies up to 0.5 THz. This result indicates that the sample volume needed in multi-frequency HFESR can be greatly reduced by several orders of magnitude, and our novel technique would be a promising tool for HFESR studies of metalloproteins in the future.

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Acknowledgements

This research was partly supported by Grants-in-Aid for Scientific Research (B) (Nos. 22340101 and 26287081) and by a Grant-in-Aid for Challenging Exploratory Research (No. 26610104) from JSPS, by the Canon Foundation, by the Motizuki Fund of Yukawa Memorial Foundation, and by the Murata Science Foundation.

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Authors and Affiliations

  1. Graduate School of Science, Kobe University, 1-1 Rokkodai-cho, Nada, Kobe, 657-8501, Japan

    Tsubasa Okamoto & Eiji Ohmichi

  2. Organization for Advanced and Integrated Research, Kobe University, 1-1 Rokkodai-cho, Nada, Kobe, 657-8501, Japan

    Hideyuki Takahashi

  3. Molecular Photoscience Research Center, Kobe University, 1-1 Rokkodai-cho, Nada, Kobe, 657-8501, Japan

    Hitoshi Ohta

Authors
  1. Tsubasa Okamoto
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  2. Hideyuki Takahashi
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  3. Eiji Ohmichi
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  4. Hitoshi Ohta
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Corresponding author

Correspondence to Tsubasa Okamoto.

Additional information

The original version of this article has been revised: The equations (3) and (4) were incorrect. Now, these equations have been corrected.

An erratum to this article is available at http://dx.doi.org/10.1007/s00723-017-0881-1.

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Okamoto, T., Takahashi, H., Ohmichi, E. et al. Force-detected ESR Measurements in a Terahertz Range up to 0.5 THz and Application to Hemin. Appl Magn Reson 48, 435–444 (2017). https://doi.org/10.1007/s00723-017-0872-2

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  • DOI: https://doi.org/10.1007/s00723-017-0872-2

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