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

Koichiro Miyanishi¹, Takuya F. Segawa^2,3, Kazuyuki Takeda⁴,
Izuru Ohki⁵, Shinobu Onoda^6,7, Takeshi Ohshima^6,7, Hiroshi Abe^6,7,
Hideaki Takashima⁸, Shigeki Takeuchi⁸, Alexander I. Shames⁹,
Kohki Morita⁵, Yu Wang⁴, Frederick T.-K. So^2,6, Daiki Terada^2,6,
Ryuji Igarashi^6,7,10, Akinori Kagawa^1,10,11, Masahiro Kitagawa^1,11,
Norikazu Mizuochi⁵, Masahiro Shirakawa^2,6,and Makoto Negoro^6,10,11

Magn. Reson., 2, 33–48, 2021

¹ Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan

² Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-Ku, Kyoto 615-8510, Japan

³ Laboratory for Solid State Physics, ETH Zurich, 8093 Zurich, Switzerland

⁴ Division of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan

⁵ Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan

⁶ Institute for Quantum Life Science, National Institutes for Quantum and Radiological Science and Technology, 4-9-1, Anagawa, Inage-Ku, Chiba 263-8555, Japan

⁷ Takasaki Advanced Radiation Research Institute, National Institutes for Quantum and Radiological Science and Technology, 1233 Watanuki, Takasaki, Gunma 370-1292, Japan

⁸ Department of Electronic Science and Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan

⁹ Department of Physics, Ben-Gurion University of the Negev, 8410501 Beer-Sheva, Israel

¹⁰ JST, PRESTO, Kawaguchi, Japan

¹¹ Center for Quantum Information and Quantum Biology, Institute for Open and Transdisciplinary Research Initiatives, Osaka University, 1-2 Machikaneyama, Toyonaka, Osaka 560-0043, Japan