کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5407399 | 1393215 | 2008 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Two-dimensional imaging of two types of radicals by the CW-EPR method
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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: Two-dimensional imaging of two types of radicals by the CW-EPR method Two-dimensional imaging of two types of radicals by the CW-EPR method](/preview/png/5407399.png)
چکیده انگلیسی
The CW-EPR method of image reconstruction is based on sample rotation in a magnetic field with a constant gradient (50Â G/cm). In order to obtain a projection (radical density distribution) along a given direction, the EPR spectra are recorded with and without the gradient. Deconvolution, then gives the distribution of the spin density. Projection at 36 different angles gives the information that is necessary for reconstruction of the radical distribution. The problem becomes more complex when there are at least two types of radicals in the sample, because the deconvolution procedure does not give satisfactory results. We propose a method to calculate the projections for each radical, based on iterative procedures. The images of density distribution for each radical obtained by our procedure have proved that the method of deconvolution, in combination with iterative fitting, provides correct results. The test was performed on a sample of polymer PPS Br 111 (p-phenylene sulphide) with glass fibres and minerals. The results indicated a heterogeneous distribution of radicals in the sample volume. The images obtained were in agreement with the known shape of the sample.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetic Resonance - Volume 190, Issue 1, January 2008, Pages 52-59
Journal: Journal of Magnetic Resonance - Volume 190, Issue 1, January 2008, Pages 52-59
نویسندگان
Tomasz Czechowski, Ryszard Krzyminiewski, Jan Jurga, Wojciech Chlewicki,