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Room-temperature hyperpolarization of polycrystalline samples with optically polarized triplet electrons: pentacene or nitrogen-vacancy center in diamond?
- Source :
- Magnetic Resonance; 2021, Vol. 2 Issue 1, p33-48, 16p
- Publication Year :
- 2021
-
Abstract
- We demonstrate room-temperature <superscript>13</superscript>C hyperpolarization by dynamic nuclear polarization (DNP) using optically polarized triplet electron spins in two polycrystalline systems: pentacene-doped [carboxyl-<superscript>13</superscript>C] benzoic acid and microdiamonds containing nitrogen-vacancy (NV-) centers. For both samples, the integrated solid effect (ISE) is used to polarize the <superscript>13</superscript>C spin system in magnetic fields of 350-400mT. In the benzoic acid sample, the <superscript>13</superscript>C spin polarization is enhanced by up to 0.12% through direct electron-to-<superscript>13</superscript>C polarization transfer without performing dynamic ¹H polarization followed by ¹H-<superscript>13</superscript>C cross-polarization. In addition, the ISE has been successfully applied to polarize naturally abundant <superscript>13</superscript>C spins in a microdiamond sample to 0.01 %. To characterize the buildup of the <superscript>13</superscript>C polarization, we discuss the efficiencies of direct polarization transfer between the electron and <superscript>13</superscript>C spins as well as that of <superscript>13</superscript>C-<superscript>13</superscript>C spin diffusion, examining various parameters which are beneficial or detrimental for successful bulk dynamic <superscript>13</superscript>C polarization. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 26990016
- Volume :
- 2
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Magnetic Resonance
- Publication Type :
- Academic Journal
- Accession number :
- 154875670
- Full Text :
- https://doi.org/10.5194/mr-2-33-2021