Electron Magnetic Resonance Principles

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If a magnetic moment (vector) of the electron is placed into an external magnetic field, it would be divided into two different levels: one parallel to the applied field (high level), and another antiparallel to the field (low level). The magnetic moments of low level transit to the high level when they absorb an appropriate frequency of electromagnetic wave under certain conditions. Such transition is called magnetic resonance transition. When the course of the magnetic moment is from the electron, it is called “electronic magnetic resonance” (EMR) transition; when the course is from the nucleus, it is called “nuclear magnetic resonance” (NMR) transition.

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Yuanzhi Xu, Jia Yao Electron Magnetic Resonance Principles Also of Interest Atomic Emission Spectrometry. AES – Spark, Arc, Laser Excitation Golloch, Joosten, Killewald, Flock,  ISBN ----, e-ISBN ---- Elemental Analysis. An Introduction to Modern Spectrometric Techniques Schlemmer, Balcaen, Todolí, Hinds,  ISBN ----, e-ISBN ---- Elastic Light Scattering Spectrometry. Huang, Ling, Wang,  ISBN ----, e-ISBN ---- Modern X-Ray Analysis on Single Crystals. A Practical Guide Luger,  ISBN ----, e-ISBN ---- Yuanzhi Xu, Jia Yao Electron Magnetic Resonance Principles Authors Dr. Yuanzhi Xu Department of Chemistry Zhejiang University Hangzhou P. R. China Dr. Jia Yao Department of Chemistry Zhejiang University Hangzhou P. R. China ISBN 978-3-11-052800-8 e-ISBN (PDF) 978-3-11-056857-8 e-ISBN (EPUB) 978-3-11-062010-8 Library of Congress Control Number: 2018951868 Bibliographic information published by the Deutsche Nationalbibliothek The Deutsche Nationalbibliothek lists this publication in the Deutsche Nationalbibliografie; detailed bibliographic data are available on the Internet at http://dnb.dnb.de. © 2019 Walter de Gruyter GmbH and Tsinghua University Press, Berlin/Boston/Beijing Typesetting: Integra Software Services Pvt. Ltd. Printing and binding: CPI books GmbH, Leck Cover image: Jakarin2521/ iStock / Getty Images Plus www.degruyter.com To My Dear Friend Professor Zuwen Qiu Foreword This book more specifically stresses on the aspect of foundational principle of EMR. The contents include the following: Introduction, theoretical basics, g -tensor theory, isotropical hyperfine structure of spectrum, anisotropic hyperfine structure of spectrum, fine structure of spectrum, relaxation theory and lineshape, linewidths, quantitative determination, paramagnetic species in gas phase and lineshape, linewidths, quantitative determination, paramagnetic species in gas phase and inorganic radicals, spectra of transition metal ions and their complexes, and so on. Quantitative determination of spectrum, discussed in Chapter 8, is one of the most difficult problems in EMR. Usually, the samples of EMR are in liquid or solid state. Chapter 9 discusses paramagnetic species in gas phase, and inorganic radical specially. Of the 107 elements in the periodic table, there are 57 transition metal (including rare earth) group elements, and their EMR spectra have some special characteristics. This is discussed in Chapter 10. ENDOR, ELDOR, Pulse-EMR, and EMRI have been included in Appendix 1 for readers to refer to. Appendix 2 “Mathematic Preparation” and Appendix 3 “Angular Momentum and Stable State Perturbation Theory in Quantum Mechanics” help readers to replenish the basics of mathematics and physics. Important aspects of modern EMR methods are considered in Appendix 1. This is pulse technique. In EMR, these methods have been developed in the last decade. It can be expected that these methods will be described in detail in the main part of the book in future,
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