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

作者：Shen Gui Ping; Cai Cong Bo; Cai Shu Hui^*; Chen Zhong

来源：Chinese Physics B, 2009, 18(11): 4797-4806.

DOI：10.1088/1674-1056/18/11/032

• nuclear magnetic resonance
• intermolecular double-quantum coherences
• distant dipolar field
• diffusion

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.

• 出版日期2009-11
• 单位厦门大学