STUDY OF NATURAL DIAMONDS BY DYNAMIC NUCLEAR POLARIZATION-ENHANCED C-13 NUCLEAR-MAGNETIC-RESONANCE SPECTROSCOPY

	STUDY OF NATURAL DIAMONDS BY DYNAMIC NUCLEAR POLARIZATION-ENHANCED C-13 NUCLEAR-MAGNETIC-RESONANCE SPECTROSCOPY
	HU, HB; LI, LY; YANG, BL; ZHOU, JW; YE, CH; CHEN, F; GUO, JG; QIU, JQ; DAN, ZH
刊名	SOLID STATE NUCLEAR MAGNETIC RESONANCE
	1994-11-01
卷号	3 期号:6 页码:339-351
关键词	Natural Diamond Dynamic Nuclear Polarization High-resolution Solid-state C-13 Nuclear Magnetic Resonance
ISSN号	0926-2040
文献子类	Article
英文摘要	The results of a study of two types of natural-diamond crystals by dynamic nuclear polarization (DNP)-enhanced high-resolution solid-state C-13 nuclear magnetic resonance (NMR) are reported. The home-built DNP magic-angle spinning (MAS) C-13 NMR spectrometer operates at 54 GHz for electrons and 20.2 MHz for carbons. The power of the microwave source was about 30 W and the highest DNP enhancement factor came near to 10(3). It was shown that in the MAS spectra the C-13 NMR linewidths of the I(b)-type diamond were broader than those of I(aB3-type diamond. From the hyperfine structure of the DNP enhancement as a function of frequency, four kinds of nitrogen-centered and one kind of carbon-centered free radicals could be identified in the I(b)-type diamond. The hyperfine structures of the DNP enhancement curve that originated from the anisotropic hyperfine interaction between electron and nuclei could be partially averaged out by MAS. The C-13 polarization time of DNP was rather long, i.e. 1500 s, and the spin-lattice relaxation time (without microwave irradiation) was about 300 s, which was somewhat shorter than anticipated. Discussions on these experimental results have been made in this report.
WOS关键词	SOLIDS ; NMR
WOS研究方向	Chemistry ; Physics ; Spectroscopy
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:A1994PU47800005
内容类型	期刊论文
源URL	[http://ir.wipm.ac.cn/handle/112942/12487]
专题	中国科学院武汉物理与数学研究所
通讯作者	ZHOU, JW
推荐引用方式 GB/T 7714	HU, HB,LI, LY,YANG, BL,et al. STUDY OF NATURAL DIAMONDS BY DYNAMIC NUCLEAR POLARIZATION-ENHANCED C-13 NUCLEAR-MAGNETIC-RESONANCE SPECTROSCOPY[J]. SOLID STATE NUCLEAR MAGNETIC RESONANCE,1994,3(6):339-351.
APA	HU, HB.,LI, LY.,YANG, BL.,ZHOU, JW.,YE, CH.,...&DAN, ZH.(1994).STUDY OF NATURAL DIAMONDS BY DYNAMIC NUCLEAR POLARIZATION-ENHANCED C-13 NUCLEAR-MAGNETIC-RESONANCE SPECTROSCOPY.SOLID STATE NUCLEAR MAGNETIC RESONANCE,3(6),339-351.
MLA	HU, HB,et al."STUDY OF NATURAL DIAMONDS BY DYNAMIC NUCLEAR POLARIZATION-ENHANCED C-13 NUCLEAR-MAGNETIC-RESONANCE SPECTROSCOPY".SOLID STATE NUCLEAR MAGNETIC RESONANCE 3.6(1994):339-351.