کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5420844 | 1395474 | 2009 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Heteronuclear dipolar recoupling of half-integer quadrupole nuclei under fast magic angle spinning
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Heteronuclear dipolar recoupling of half-integer quadrupole nuclei under fast magic angle spinning Heteronuclear dipolar recoupling of half-integer quadrupole nuclei under fast magic angle spinning](/preview/png/5420844.png)
چکیده انگلیسی
An experimental method for the heteronuclear dipolar recoupling of half-integer quadrupole nuclei is proposed. The idea is to manipulate the central transition based on the recoupling technique of spin-polarization-inversion rotary resonance. This method allows the extraction of structural parameters under fast magic-angle spinning. Its validity has been examined by the average Hamiltonian theory and numerical simulations. The initial rotational-echo dephasing arising from the dipolar evolution can be approximated by a parabolic function, from which the heteronuclear van Vleck second moment can be estimated. A factor, estimated from two-spin simulations, is required to account for the effects of the quadrupolar coupling and is rather independent of the geometry and the orders of the spin systems. Our method can facilitate the structural characterization of materials containing half-integer quadrupole nuclei under high-resolution condition. Experimental verification has been carried out on two aluminophosphate systems, namely, AlPO4-5 and AlPO4-11.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Nuclear Magnetic Resonance - Volume 36, Issue 2, October 2009, Pages 110-117
Journal: Solid State Nuclear Magnetic Resonance - Volume 36, Issue 2, October 2009, Pages 110-117
نویسندگان
Shin-Jong Huang, Shang-Bin Liu, Jerry C.C. Chan,