Apparent diffusion behaviour of intermolecular double-quantum coherence modulated by a distant dipolar field in solution NMR
Shen Gui-Ping(沈桂平)a),Cai Cong-Bo(蔡聪波) b), Cai Shu-Hui(蔡淑惠)a)†, and Chen Zhong(陈忠)a)
a Department of Physics, Fujian Key Laboratory of Plasma and Magnetic Resonance, Xiamen University, Xiamen 361005, China; b Department of Communications Engineering, Xiamen University, Xiamen 361005, China
Abstract A modified correlated spectroscopy (COSY) revamped with asymmetric Z-gradient echo detection sequence was designed to investigate the influence of diffusion behaviour on intermolecular double-quantum coherence signal attenuation during the pre-acquisition period. Theoretical formulas were deduced and experimental measurements and simulations were performed. It is found that the diffusion behaviour of intermolecular double-quantum coherence in the pre-acquisition period may be different from that of conventional single-quantum coherence, depending on the relative orientation of diffusion weighting gradients to coherence selection gradients. When the orientation of the diffusion weighting gradients is parallel or anti-parallel to the orientation of the coherence selection gradients, the diffusion is modulated by the distant dipolar field. This study is helpful for understanding the signal properties in intermolecular double-quantum coherence magnetic resonance imaging.
Received: 15 April 2009
Revised: 11 May 2009
Accepted manuscript online:
PACS:
66.30.H-
(Self-diffusion and ionic conduction in nonmetals)
Fund: Project supported by the National
Natural Science Foundation of China (Grant No 10875101) and the
Natural Science Foundation of Fujian Province, China (Grant No
2008J0028).
Cite this article:
Shen Gui-Ping(沈桂平),Cai Cong-Bo(蔡聪波), Cai Shu-Hui(蔡淑惠), and Chen Zhong(陈忠) Apparent diffusion behaviour of intermolecular double-quantum coherence modulated by a distant dipolar field in solution NMR 2009 Chin. Phys. B 18 4797
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