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Deuteron double-quantum NMR imaging of molecular order and mobility in solid polymers

 

作者: E. Günther,   B. Blümich,   H.W. Spiess,  

 

期刊: Molecular Physics  (Taylor Available online 1990)
卷期: Volume 71, issue 3  

页码: 477-489

 

ISSN:0026-8976

 

年代: 1990

 

DOI:10.1080/00268979000101921

 

出版商: Taylor & Francis Group

 

数据来源: Taylor

 

摘要:

A novel solid-state deuteron NMR method for spectroscopic imaging is presented. It employs information about molecular orientation and dynamics obtained from broad2H-NMR lineshapes governed by the anisotropic quadrupole interaction without sacrificing spatial resolution. To this end, double-quantum coherence is created, which is independent of the strength of the quadrupole coupling. In a Fourier-imaging scheme magnetic-field gradients are applied for spatial encoding during the evolution of double-quantum coherence. In the detection period single-quantum coherence is recorded, providing a spectroscopic dimension with a wide-line spectrum. Its lineshape contains spatially resolved information about molecular orientation and dynamics. Experimental results are presented for orientation imaging of drawn polyethylene and molecular-dynamics imaging in a composite sample of glassy polystyrene and glassy polycarbonate, where the two species can be discriminated based on both the NMR lineshape and the spin-lattice relaxation timeT1.

 

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