Transcription of Electron Paramagnetic Resonance Theory E. Duin
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Electron Paramagnetic Resonance Theory E. Duin
1 - 1 Electron Paramagnetic Resonance Theory E. Duin 1 - 2 1. Basic EPR Theory Introduction This course manual will provide the reader with a basic understanding needed to be able to get useful information using the technique of Electron Paramagnetic Resonance (EPR) spectroscopy . EPR spectroscopy is similar to any other technique that depends on the absorption of electromagnetic radiation. A molecule or atom has discrete (or separate) states, each with a corresponding energy. spectroscopy is the measurement and interpretation of the energy differences between the atomic or molecular states. With knowledge of these energy differences, you gain insight into the identity, structure, and dynamics of the sample under study. We can measure these energy differences, E, because of an important relationship between E and the absorption of electromagnetic radiation.
In conventional spectroscopy, ν is varied or swept and the frequencies at which absorption occurs correspond to the energy differences of the states. (We shall see later that EPR differs slightly.) Typically, the frequencies vary from the megahertz range for NMR (Nuclear Magnetic Resonance) (AM, FM, and TV transmissions
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