کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9587336 | 1393235 | 2005 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Heteronuclear decoupling under fast MAS by a rotor-synchronized Hahn-echo pulse train
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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 decoupling under fast MAS by a rotor-synchronized Hahn-echo pulse train Heteronuclear decoupling under fast MAS by a rotor-synchronized Hahn-echo pulse train](/preview/png/9587336.png)
چکیده انگلیسی
A new heteronuclear decoupling mechanism under fast magic-angle spinning MAS is introduced. It is based on refocusing the coherences responsible for the dephase of low-γ nuclei (13C, 15N) transverse spin-polarization in the presence of strongly dipolar-coupled protons, and has the advantage that can be implemented by pulsed techniques, with all the benefits resulting from a reduced duty cycle compared with conventional decoupling by continuous rf irradiation. The decoupling efficiency of a simple rotor-synchronized Hahn-echo pulse train is analyzed both theoretically and experimentally. It was found that a substantial improvement in sensitivity and resolution can be achieved in compounds with small 1H chemical shielding parameters even at moderate sample spinning, and some interesting applications are shown. It is also shown that much faster spinning frequencies, or alternative refocusing sequences, are needed for applications on rigid organic solids, i.e., in systems with larger 1H chemical shifts.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetic Resonance - Volume 176, Issue 2, October 2005, Pages 239-243
Journal: Journal of Magnetic Resonance - Volume 176, Issue 2, October 2005, Pages 239-243
نویسندگان
Xenia Filip, Carmen Tripon, Claudiu Filip,