中国物理B ›› 2009, Vol. 18 ›› Issue (11): 4797-4806.doi: 10.1088/1674-1056/18/11/032

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Apparent diffusion behaviour of intermolecular double-quantum coherence modulated by a distant dipolar field in solution NMR

蔡聪波1, 沈桂平2, 蔡淑惠2, 陈忠2   

  1. (1)Department of Communications Engineering, Xiamen University, Xiamen 361005, China; (2)Department of Physics, Fujian Key Laboratory of Plasma and Magnetic Resonance, Xiamen University, Xiamen 361005, China
  • 收稿日期:2009-04-15 修回日期:2009-05-11 出版日期:2009-11-20 发布日期:2009-11-20
  • 基金资助:
    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).

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)   

  1. 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
  • Received:2009-04-15 Revised:2009-05-11 Online:2009-11-20 Published:2009-11-20
  • Supported by:
    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).

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摘要： 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.

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.

Key words: nuclear magnetic resonance, intermolecular double-quantum coherences, distant dipolar field, diffusion

中图分类号:  (Self-diffusion and ionic conduction in nonmetals)

  • 66.30.H-
76.60.Lz (Spin echoes)