کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5407120 | 1393204 | 2008 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
HYSCORE and DEER with an upgraded 95Â GHz pulse EPR spectrometer
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: HYSCORE and DEER with an upgraded 95Â GHz pulse EPR spectrometer HYSCORE and DEER with an upgraded 95Â GHz pulse EPR spectrometer](/preview/png/5407120.png)
چکیده انگلیسی
The set-up of a new microwave bridge for a 95Â GHz pulse EPR spectrometer is described. The virtues of the bridge are its simple and flexible design and its relatively high output power (0.7Â W) that generates Ï pulses of 25Â ns and a microwave field, B1Â =Â 0.71 mT. Such a high B1 enhances considerably the sensitivity of high field double electron-electron resonance (DEER) measurements for distance determination, as we demonstrate on a nitroxide biradical with an interspin distance of 3.6Â nm. Moreover, it allowed us to carry out HYSCORE (hyperfine sublevel-correlation) experiments at 95Â GHz, observing nuclear modulation frequencies of 14N and 17O as high as 40Â MHz. This opens a new window for the observation of relatively large hyperfine couplings, yet not resolved in the EPR spectrum, that are difficult to observe with HYSCORE carried out at conventional X-band frequencies. The correlations provided by the HYSCORE spectra are most important for signal assignment, and the improved resolution due to the two dimensional character of the experiment provides 14N quadrupolar splittings.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetic Resonance - Volume 194, Issue 1, September 2008, Pages 8-15
Journal: Journal of Magnetic Resonance - Volume 194, Issue 1, September 2008, Pages 8-15
نویسندگان
Daniella Goldfarb, Yaakov Lipkin, Alexey Potapov, Yehoshua Gorodetsky, Boris Epel, Arnold M. Raitsimring, Marina Radoul, Ilia Kaminker,