Room-temperature hyperpolarization of polycrystalline samples with optically polarized triplet electrons: pentacene or nitrogen-vacancy center in diamond?
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Published:2021-02-17
Issue:1
Volume:2
Page:33-48
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ISSN:2699-0016
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Container-title:Magnetic Resonance
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language:en
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Short-container-title:Magn. Reson.
Author:
Miyanishi Koichiro, Segawa Takuya F.ORCID, Takeda KazuyukiORCID, Ohki IzuruORCID, Onoda Shinobu, Ohshima TakeshiORCID, Abe HiroshiORCID, Takashima Hideaki, Takeuchi Shigeki, Shames Alexander I., Morita KohkiORCID, Wang Yu, So Frederick T.-K., Terada Daiki, Igarashi Ryuji, Kagawa Akinori, Kitagawa Masahiro, Mizuochi NorikazuORCID, Shirakawa Masahiro, Negoro Makoto
Abstract
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.
Funder
Ministry of Education, Culture, Sports, Science and Technology Precursory Research for Embryonic Science and Technology Branco Weiss Fellowship – Society in Science Japan Society for the Promotion of Science Core Research for Evolutional Science and Technology
Publisher
Copernicus GmbH
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