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核磁共振中分子间多量子相干CRAZED序列参数的优化 被引量：1

Optimized Parameters in Intermolecular Multiple-quantum Coherence NMR with CRAZED Sequence
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摘要 对检测分子间多量子相干信号的CRAZED脉冲序列的最佳射频脉冲翻转角及延迟时间进行了探讨.通过综合运用偶极场理论和积算符公式,得到不同相干阶数下CRAZED序列的相对信号强度与射频脉冲翻转角及延迟时间之间关系的表达式,并利用计算机模拟对延迟时间进行优化,所得结果由实验加以验证.实验结果表明,理论得到的信噪比和最佳延迟时间的关系与实验结果吻合得较好.因此,所得出的理论方法可用于指导实验参数的优化选择. In this paper,optimal radio freqency (RF) flip angle and relaxation delay time of the CRAZED pulse sequence for intermolecular multiple quantum coherences (iMQCs) of different order n were investigated.An analytical expression for the dependence of relative signal intensity on RF flip angle and relaxation delay time was derived from a combination of dipolar demagnetizing field treatment and product operator formalism.Computer simulation was then used to optimize the delay time for the maximal signal-noise-ratio (SNR).The simulated results are found to be in good agreement with experimental ones.Therefore,the theoretical method proposed herein can be used to design optimal experimental parameters.
作者 曾群英 蔡淑惠 朱小钦 陈忠
机构地区 厦门大学物理学系固体表面物理化学国家重点实验室
出处 《厦门大学学报（自然科学版）》 CAS CSCD 北大核心 2005年第2期176-180,共5页 Journal of Xiamen University：Natural Science
基金 国家自然科学基金(10104011) 福建省自然科学基金(A0210003) 固体表面物理化学国家重点实验室基金资助
关键词 核磁共振技术 分子间多量子相干 脉冲序列 延迟时间 参数优化 信噪比 NMR iMQCs pulse sequence delay time optimal parameters
分类号 O482.532 [理学—固体物理]
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参考文献11

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同被引文献11

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引证文献1

厦门大学学报（自然科学版）
2005年 第2期

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