| 周期性控制液态磁共振自旋湍流的研究(英文) |
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| 引用本文： | Susie Y.HUANG,Jamie D.WALLS,林永雅.周期性控制液态磁共振自旋湍流的研究(英文)[J].波谱学杂志,2010,27(3):425-435. |
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| 作者姓名： | Susie Y.HUANG Jamie D.WALLS 林永雅 |
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| 作者单位： | 加州大学洛杉矶校区,化学与生物化学系,加利福尼亚州,90095,美国;加州大学洛杉矶校区,化学与生物化学系,加利福尼亚州,90095,美国;加州大学洛杉矶校区,化学与生物化学系,加利福尼亚州,90095,美国 |
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| 基金项目： | Camille and Henry Dreyfus Foundation，Research Corporation，NSF，donors of the Petroleum Research Fund，NSF Graduate Research Fellowship Program(SYH) |
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| 摘 要： | 辐射阻尼和远程偶极场联合作用导致的混沌自旋动态能够产生常见于高场梯度磁共振实验中不可再现的实验结果,且该现象较先前所认为的更为常见.该文发展了一种基于射频微扰的周期性控制方法,以降低Lyapunov指数并抑制在波谱中的不稳定测量结果.同时讨论了周期性控制的设计原则及如何应用在诸多脉冲序列中,用以抑制自旋湍流.
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| 关 键 词： | 暂态性自旋湍流 辐射阻尼 远程偶极场 混沌控制 信号放大 |
| 收稿时间： | 2010-07-16 |
Periodic Control of Spin Turbulence in Solution Magnetic Resonance |
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| Susie Y.HUANG,Jamie D.WALLS,Yung-Ya LIN.Periodic Control of Spin Turbulence in Solution Magnetic Resonance[J].Chinese Journal of Magnetic Resonance,2010,27(3):425-435. |
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| Authors: | Susie YHUANG Jamie DWALLS Yung-Ya LIN |
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| Institution: | Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA 90095, USA |
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| Abstract: | Chaotic spin dynamics arising from the joint action of radiation damping and the distant dipolar field are shown to generate irreproducible measurements in popular high-field gradient magnetic resonance experiments,a phenomenon more general than previously thought.A periodic control scheme based on radio-frequency perturbations is developed that decreases the leading Lyapunov exponent and reduces observed fluctuations to within intrinsic spectrometer instability.General guidelines for designing and integrating such schemes into existing pulse sequences to suppress spin chaos are discussed. |
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| Keywords: | transient spin chaos radiation damping distant dipolar field chaos control signal amplification |
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