کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9587463 | 1393244 | 2005 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Photo-CIDNP experiments with an optimized presaturation pulse train, gated continuous illumination, and a background-nulling pulse grid
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Photo-CIDNP experiments with an optimized presaturation pulse train, gated continuous illumination, and a background-nulling pulse grid Photo-CIDNP experiments with an optimized presaturation pulse train, gated continuous illumination, and a background-nulling pulse grid](/preview/png/9587463.png)
چکیده انگلیسی
Methods to record chemically induced dynamic nuclear polarization (CIDNP) spectra that are virtually free from background magnetization and avoid the sensitivity loss and subtraction artifacts of difference spectroscopy have been developed. Presaturation by a string of composite Ï/2 pulses, each followed by a defocussing field gradient, is analyzed, and guidelines for the optimization of pulse phases and gradient strengths are derived. Subsequent gated illumination during a grid of Ï pulses with a prescribed timing causes the background magnetization to vanish at those moments of a pulse sequence when CIDNP magnetization is to be sampled or transferred. By shifting the illumination intervals within such a grid, the sign of the polarizations can be inverted without influencing the development of the background magnetization, allowing a further strong suppression of residual background by a phase cycle. Experimental examples for the application of these methods to more complex CIDNP experiments (1D-CIDNP-COSY, 1D-CIDNP-TOCSY, CIDNP-induced heteronuclear Overhauser effects, water suppression in protein CIDNP) are given.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetic Resonance - Volume 177, Issue 2, December 2005, Pages 236-246
Journal: Journal of Magnetic Resonance - Volume 177, Issue 2, December 2005, Pages 236-246
نویسندگان
Martin Goez, K. Hun Mok, P.J. Hore,