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Quantitative EPR

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There is a growing need in both industrial and academic research to obtain accurate quantitative results from continuous wave (CW)... Weiterlesen
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Beschreibung

There is a growing need in both industrial and academic research to obtain accurate quantitative results from continuous wave (CW) electron paramagnetic resonance (EPR) experiments. This book describes various sample-related, instrument-related and software-related aspects of obtaining quantitative results from EPR expe- ments. Some speci?c items to be discussed include: selection of a reference standard, resonator considerations (Q, B ,B ), power saturation, sample position- 1 m ing, and ?nally, the blending of all the factors together to provide a calculation model for obtaining an accurate spin concentration of a sample. This book might, at ?rst glance, appear to be a step back from some of the more advanced pulsed methods discussed in recent EPR texts, but actually quantitative 'routine CW EPR' is a challenging technique, and requires a thorough understa- ing of the spectrometer and the spin system. Quantitation of CW EPR can be subdivided into two main categories: (1) intensity and (2) magnetic ?eld/mic- wave frequency measurement. Intensity is important for spin counting. Both re- tive intensity quantitation of EPR samples and their absolute spin concentration of samples are often of interest. This information is important for kinetics, mechanism elucidation, and commercial applications where EPR serves as a detection system for free radicals produced in an industrial process. It is also important for the study of magnetic properties. Magnetic ?eld/microwave frequency is important for g and nuclear hyper?ne coupling measurements that re?ect the electronic structure of the radicals or metal ions.

Klappentext
This is the first comprehensive yet practical guide for people who perform quantitative EPR measurements. No existing book provides this level of practical guidance to ensure the successful use of EPR. There is a growing need in both industrial and academic research to provide meaningful and accurate quantitative EPR results. This text discusses the various sample, instrument and software related aspects required for EPR quantitation. Specific topics include: choosing a reference standard, resonator considerations (Q, B1, Bm), power saturation characteristics, sample positioning, and finally, putting all the factors together to obtain an accurate spin concentration of a sample.

Inhalt
Basics of Continuous Wave EPR.- Why Should Measurements Be Quantitative?.- Important Principles for Quantitative EPR.- A More in Depth Look at the EPR Signal Response.- Practical Advice About Crucial Parameters.- A Deeper Look at B1 and Modulation Field Distribution in a Resonator.- Resonator Q.- Filling Factor.- Temperature.- Magnetic Field and Microwave Frequency.- Standard Samples.

Produktinformationen

Titel: Quantitative EPR
Untertitel: A Practitioners Guide
Autor:
EAN: 9783211929483
ISBN: 978-3-211-92948-3
Digitaler Kopierschutz: Wasserzeichen
Format: E-Book (pdf)
Herausgeber: Springer
Genre: Physik, Astronomie
Anzahl Seiten: 185
Veröffentlichung: 10.04.2010
Jahr: 2010
Untertitel: Englisch
Dateigrösse: 4.1 MB