論文

査読有り
2021年2月17日

Room-temperature hyperpolarization of polycrystalline samples with optically polarized triplet electrons: pentacene or nitrogen-vacancy center in diamond?

Magnetic Resonance
  • Koichiro Miyanishi
  • Takuya F. Segawa
  • Kazuyuki Takeda
  • Izuru Ohki
  • Shinobu Onoda
  • Takeshi Ohshima
  • Hiroshi Abe
  • Hideaki Takashima
  • Shigeki Takeuchi
  • Alexander I. Shames
  • Kohki Morita
  • Yu Wang
  • Frederick T.-K. So
  • Daiki Terada
  • Ryuji Igarashi
  • Akinori Kagawa
  • Masahiro Kitagawa
  • Norikazu Mizuochi
  • Masahiro Shirakawa
  • Makoto Negoro
  • 全て表示

2
1
開始ページ
33
終了ページ
48
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.5194/mr-2-33-2021
出版者・発行元
Copernicus GmbH

Abstract. We demonstrate room-temperature 13C hyperpolarization by dynamic nuclear polarization (DNP) using optically polarized triplet electron spins in two polycrystalline systems: pentacene-doped [carboxyl-13C] benzoic acid and microdiamonds containing nitrogen-vacancy (NV−) centers. For both samples, the integrated solid effect (ISE) is used to polarize the 13C spin system in magnetic fields of 350–400 mT. In the benzoic acid sample, the 13C spin polarization is enhanced by up to 0.12 % through direct electron-to-13C polarization transfer without performing dynamic 1H polarization followed by 1H−13C cross-polarization. In addition, the ISE has been successfully applied to polarize naturally abundant 13C spins in a microdiamond sample to 0.01 %. To characterize the buildup of the 13C polarization, we discuss the efficiencies of direct polarization transfer between the electron and 13C spins as well as that of 13C−13C spin diffusion, examining various parameters which are beneficial or detrimental for successful bulk dynamic 13C polarization.

リンク情報
DOI
https://doi.org/10.5194/mr-2-33-2021
URL
https://mr.copernicus.org/articles/2/33/2021/mr-2-33-2021.pdf
ID情報
  • DOI : 10.5194/mr-2-33-2021
  • eISSN : 2699-0016

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