کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5406916 1393194 2009 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Double quantum transition as the origin of the central dip in the z-spectrum of HDO in variably stretched gel
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Double quantum transition as the origin of the central dip in the z-spectrum of HDO in variably stretched gel
چکیده انگلیسی
The 2H NMR spectrum of HDO in gelatin gel, that is stretched inside silicone rubber tubing, displays a well resolved doublet. Spectra were obtained with a range of offset frequencies of partially saturating radio-frequency (RF) radiation. The resulting steady-state irradiation envelope (also referred to as a 'z-spectrum') has the peculiar feature that maximal suppression of the doublet occurs when the irradiation is applied exactly at the centre frequency, between the two HDO peaks. We present a quantum mechanical explanation for this phenomenon. It is shown that the phenomenon is the result of double quantum transitions. The analysis is extendable to more complex quadrupolar and dipolar-coupled systems of other nuclides. It has implications for enhancement of contrast in magnetic resonance imaging of heterogeneous systems using dipolar and quadrupolar interactions.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetic Resonance - Volume 198, Issue 2, June 2009, Pages 197-203
نویسندگان
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