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.
点击下载:
PDF (757KB)
返 回