کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5420696 | 1507514 | 2008 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Field-cycling NMR investigations of 13C-1H cross-relaxation and cross-polarisation: The nuclear solid effect and dynamic nuclear polarisation
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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: Field-cycling NMR investigations of 13C-1H cross-relaxation and cross-polarisation: The nuclear solid effect and dynamic nuclear polarisation Field-cycling NMR investigations of 13C-1H cross-relaxation and cross-polarisation: The nuclear solid effect and dynamic nuclear polarisation](/preview/png/5420696.png)
چکیده انگلیسی
A field-cycling NMR investigation of 1H-13C polarisation transfer using cross-relaxation and the nuclear solid effect (NSE) is described. Dynamic nuclear polarisation (DNP) of the 13C spins is observed when forbidden transitions are driven by r.f. irradiation at the sum and difference Larmor frequencies of the two nuclei. When the 1H spins are pre-polarised, a significant transfer of polarisation to the 13C nuclei is achieved in a time short compared with the spin-lattice relaxation time of 13C. The cross-polarisation arising from the NSE is studied as a function of B-field and time. These results are compared with the solutions of the differential equations that govern the coupled system of 1H-13C spins. The effects of cross-relaxation are incorporated into the model for the first time and good agreement between theory and experiment is obtained. The experiments have been conducted at 20Â K on a 13C-enriched sample of benzoic acid.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Nuclear Magnetic Resonance - Volume 34, Issues 1â2, JulyâSeptember 2008, Pages 110-117
Journal: Solid State Nuclear Magnetic Resonance - Volume 34, Issues 1â2, JulyâSeptember 2008, Pages 110-117
نویسندگان
D.L. Noble, I. Frantsuzov, A.J. Horsewill,