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Observation of intermolecular double-quantum coherence signal dips in nuclear magnetic resonance |
Shen Gui-Ping(沈桂平), Cai Cong-Bo(蔡聪波), Cai Shu-Hui(蔡淑惠)†, and Chen Zhong(陈忠) |
Department of Electronic Science and Communications Engineering, Fujian Key Laboratory of Plasma and Magnetic Resonance, State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen 361005, China |
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Abstract The correlated spectroscopy revamped by asymmetric Z-gradient echo detection (CRAZED) sequence is modified to investigate intermolecular double-quantum coherence nuclear magnetic resonance signal dips in highly polarized spin systems. It is found that the occurrence of intermolecular double-quantum coherence signal dips is related to sample geometry, field inhomogeneity and dipolar correlation distance. If the field inhomogeneity is refocused, the signal dip occurs at a fixed position whenever the dipolar correlation distance approaches the sample dimension. However, the position is shifted when the field inhomogeneity exists. Experiments and simulations are performed to validate our theoretic analysis. These signal features may offer a unique way to investigate porous structures and may find applications in biomedicine and material science.
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Received: 26 January 2011
Revised: 06 April 2011
Accepted manuscript online:
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PACS:
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33.25.+k
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(Nuclear resonance and relaxation)
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31.30.jp
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(Electron electric dipole moment)
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34.80.Pa
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(Coherence and correlation)
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Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 10875101 and 11074209) and the Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20090121110030). |
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) Observation of intermolecular double-quantum coherence signal dips in nuclear magnetic resonance 2011 Chin. Phys. B 20 103301
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