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Plos One : Broadband Transmission Epr Spectroscopy, Volume 8

By Soares, M. Claudio

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Book Id: WPLBN0003944741
Format Type: PDF eBook :
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Reproduction Date: 2015

Title: Plos One : Broadband Transmission Epr Spectroscopy, Volume 8  
Author: Soares, M. Claudio
Volume: Volume 8
Language: English
Subject: Journals, Science, Medical Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary)
Historic
Publication Date:
Publisher: Plos

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Soares, M. C. (n.d.). Plos One : Broadband Transmission Epr Spectroscopy, Volume 8. Retrieved from http://netlibrary.net/


Description
Description : EPR spectroscopy employs a resonator operating at a single microwave frequency and phase-sensitive detection using modulation of the magnetic field. The X-band spectrometer is the general standard with a frequency in the 9–10 GHz range. Most (bio)molecular EPR spectra are determined by a combination of the frequency-dependent electronic Zeeman interaction and a number of frequency-independent interactions, notably, electron spin – nuclear spin interactions and electron spin – electron spin interactions, and unambiguous analysis requires data collection at different frequencies. Extant and long-standing practice is to use a different spectrometer for each frequency. We explore the alternative of replacing the narrow-band source plus single-mode resonator with a continuously tunable microwave source plus a non-resonant coaxial transmission cell in an unmodulated external field. Our source is an arbitrary wave digital signal generator producing an amplitude-modulated sinusoidal microwave in combination with a broadband amplifier for 0.8–2.7 GHz. Theory is developed for coaxial transmission with EPR detection as a function of cell dimensions and materials. We explore examples of a doublet system, a high-spin system, and an integer-spin system. Long, straigth, helical, and helico-toroidal cells are developed and tested with dilute aqueous solutions of spin label hydroxy-tempo. A detection limit of circa 5 mM HO-tempo in water at 800 MHz is obtained for the present setup, and possibilities for future improvement are discussed.

 

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