Electron Paramagnetic Resonance (EPR) Spectroscopy (original) (raw)

ChemInform Abstract: Electron Paramagnetic Resonance Spectroscopy

Cheminform, 2010

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An Analysis of Advance Electron Paramagnetic Resonance Imaging Modulation

International Journal of Innovative Research in Engineering & Management (IJIREM), 2021

In the presence of an externally applied static magnetic field, electron paramagnetic resonance (EPR), also known as electron spin resonance (ESR), is a branch of magnetic resonance spectroscopy that uses microwave radiation to probe species with unpaired electrons, such as radicals, radical cations, and triplets. The physical characteristics of the fundamental EPR theory and techniques are similar to those of Nuclear Magnetic Resonance in many respects (NMR). The most apparent distinction is that EPR probes electron spin characteristics directly, while NMR probes nuclear spins. EPR spectroscopy has a wide range of applications, from studying the kinetics and mechanisms of highly reactive radical intermediates to obtaining information about the interactions between paramagnetic metal clusters in biological enzymes, despite the fact that it is limited to substances with unpaired electron spins. EPR may also be utilised in the semiconductor sector to investigate materials containing conducting electrons.EPR is a very helpful kind of spectroscopy for studying molecules and atoms that have an unpaired electron. Because stable compounds seldom contain unpaired electrons, it is less frequently utilised than NMR. EPR, on the other hand, may be used to view tagged species in situ, either biologically or in a chemical process.

Electron Paramagnetic Resonance Spectroscopy of Solid State Samples

International Journal of Software & Hardware Research in Engineering (IJSHRE) ISSN-2347-4890, 2023

Electron Paramagnetic Resonance Spectroscopy is an experimental procedure where a paramagnetic sample is kept in a magnetic field and exposed to microwave radiation. At a specific magnetic field, the energy required to jump from the normal state of the electrons on that sample to the excited state is the same as the energy being provided by the radiation. Hence the electrons absorb the energy and attain the higher state. This absorption can be detected. By looking at what magnetic field allowed for this jump, it is possible to determine several properties about the sample. In this paper, this technique is used on DPPH and MnCl2 samples. The results have then been compared to the expected known values for those samples. In the case of DPPH, the results obtained line up with the expected values and properties. In the case of MnCl2, while measurements such as the number of hyperfine lines observed coincide with the expected ones, the hyperfine constant observed does not match the expected value. The temperature has been identified as a potential reason for this discrepancy.

Pulsed electron–electron double resonance (PELDOR) as EPR spectroscopy in nanometre range

Russian Chemical Reviews, 2008

The results of development of pulsed electron - electron double resonance (PELDOR) method and its applications in structural studies are generalised and described systematically. The foundations of the theory of the method are outlined, some methodological features and applications are considered, in particular, determination of the distances between spin labels in the nanometre range for iminoxyl biradicals, spin-labelled biomacromolecules, radical ion pairs and peptide ±membrane complexes. The attention is focussed on radical systems that form upon self-assembly of nanosized complexes (in particular, peptide complexes), spatial effects, and radical pairs in photolysis and photosynthesis. The position of PELDOR among other structural EPR techniques is analysed. The bibliography includes 157 references.