کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9587518 1393246 2005 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Optimal electric fields for different sample shapes in high resolution NMR spectroscopy
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Optimal electric fields for different sample shapes in high resolution NMR spectroscopy
چکیده انگلیسی
For many applications, reducing sample resistance, rather than increasing probe Q or filling factor, is the only way to further improve the signal-to-noise ratio of cryogenically cooled NMR probes. In this paper, bounds are calculated for the minimum sample resistance that can be achieved for various sample geometries. The sample resistance of 100 mM NaCl in H2O in 5 mm sample tubes was measured on a 600 MHz cold probe to be within 14% of the optimum value. The minimum sample resistance can however be lowered by altering the tube cross section. Rectangular tubes oriented with the long axis along the RF magnetic field are particularly favourable.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetic Resonance - Volume 174, Issue 2, June 2005, Pages 331-334
نویسندگان
,