| Autor: |
Miyanishi, Koichiro, F. Segawa, Takuya, Takeda, Kazuyuki, Ohki, Izuru, Onoda, Shinobu, Ohshima, Takeshi, Abe, Hiroshi, Takashima, Hideaki, Takeuchi, Shigeki, I. Shames, Alexander, Morita, Kohki, Wang, Yu, Frederick, T.-K. So, Terada, Daiki, Igarashi, Ryuji, Kagawa, Akinori, Kitagawa, Masahiro, Mizuochi, Norikazu, Shirakawa, Masahiro, Negoro, Makoto, Izuru, Ohki, Shinobu, Onoda, Takeshi, Ohshima, Hiroshi, Abe, So, Frederick, Daiki, Terada, Ryuji, Igarashi, Masahiro, Shirakawa, Makoto, Negoro |
| Jazyk: |
japonština |
| Rok vydání: |
2021 |
| Zdroj: |
Magnetic Resonance. 2(1):33-48 |
| ISSN: |
0730-725X |
| Popis: |
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 microdia-monds containing NV−centers. For both samples, the integrated solid effect (ISE) is used to polarize the13C spin system in magnetic fields of 350-400 mT. In the benzoic acid sample, the13C spin polarization is enhanced up to 0.12% through directelectron-to-13C polarization transfer without performing dynamic1H polarization followed by 1H-13C cross polarization. In5addition, ISE has been successfully applied for the first time to polarize naturally abundant 13C spins in a microdiamond sample to 0.01%. To characterize the buildup of the13C polarization, we discuss the efficiencies of direct polarization transfer be-tween the electron and13C spins as well as that of13C–13C spin diffusion, examining various parameters which are beneficial or detrimental for successful bulk dynamic13C polarization. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect