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

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

Magnetic Resonance : (Göttingen), 2021, Vol.2 (1), p.33-48 [Periódico revisado por pares]

Göttingen: Copernicus GmbH

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Título:
Room-temperature hyperpolarization of polycrystalline samples with optically polarized triplet electrons: pentacene or nitrogen-vacancy center in diamond?
Autor: Miyanishi, Koichiro ; Segawa, Takuya F. ; Takeda, Kazuyuki ; Ohki, Izuru ; Onoda, Shinobu ; Ohshima, Takeshi ; Abe, Hiroshi ; Takashima, Hideaki ; Takeuchi, Shigeki ; Shames, Alexander I. ; Morita, Kohki ; Wang, Yu ; So, Frederick T.-K. ; Terada, Daiki ; Igarashi, Ryuji ; Kagawa, Akinori ; Kitagawa, Masahiro ; Mizuochi, Norikazu ; Shirakawa, Masahiro ; Negoro, Makoto
Assuntos: Benzoic acid ; Diamonds ; Electron spin ; Electrons ; Experiments ; Hyperpolarization ; Laboratories ; Magnetic fields ; Microdiamonds ; NMR ; Nuclear magnetic resonance ; Polarization (spin alignment) ; Polycrystals ; Room temperature ; Single crystals ; Vacancies
É parte de: Magnetic Resonance : (Göttingen), 2021, Vol.2 (1), p.33-48
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Descrição: 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.
Editor: Göttingen: Copernicus GmbH
Idioma: Inglês

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

Göttingen: Copernicus GmbH

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