Electron magnetic resonance

The dielectric permittivity as a function of frequency may show resonance behavior in the case of gas molecules as studied in microwave spectroscopy (25) or more likely relaxation phenomena in soUds associated with the dissipative processes of polarization of molecules, be they nonpolar, dipolar, etc. There are exceptional circumstances of ferromagnetic resonance, electron magnetic resonance, or nmr. In most microwave treatments, the power dissipation or absorption process is described phenomenologically by equation 5, whatever the detailed molecular processes. 

C.J. Bender and L.J. Berliner (Eds.), Instrumental Methods in Electron Magnetic Resonance, Biological Magnetic Resonance, Vol. 21, Kluwer Academic/Plenum Publishing Corporation, New York, NY, 2004. 

Penney and Schlapp, Van Vleck and others applied these results to interpret magnetic susceptibility data of paramagnetic transition group ions in crystals. More recently, the theory has been applied with considerable success to electron magnetic resonance data 126,140,14I) and to the optical spectra 142) of paramagnetic ions in solids. 

Proton hyperfine structure at magnetic fields below 100 G in electron magnetic resonance absorptions by oriented triplet dibenzothiophene has been obtained in biphenyl single crystals. ... 

L. H. Sutcliffe, The design of spin probes for electron magnetic resonance spectroscopy and imaging, Phys. Med. Biol., 43 (1998) 1987-1993. 

ESR include electron magnetic resonance (EMR) and electron paramagnetic resonance (EPR). ESR is more limited than NMR, since it can only be used to study species with one or more unpaired electron spins. Common examples of such species are the following ... 

Tal Roze, V. L., and L. A. Blyumenfeld Connection between the electrical conductivity of organic substances with conjugated double bonds and their electron magnetic resonance spectra. Dokl. Akad. Nauk. 135, 1450 (1960). 

Abstract We overview the application of the electron magnetic resonance spectroscopy... 

Figure 5. Electron magnetic resonance spectra of a borate glass sample annealed at 753 K and recorded at different temperatures Tm with a constant gain.

Thus, electron magnetic resonance is an important tool in the detection and structure analysis of radicals in polymeric systems (during formation, oxidation, irradiation, pyrolysis and mechanical rupture). From these patterns the chemical structure of the radicals may be derived. For the study of short-lived radicals flow systems have been developed. Free radicals in glassy polymers, however, may have an extremely long life. 

The nuclear Overhauser effect (NOE), which is manifested in certain changes in the intensities of NMR lines, is a consequence of magnetic dipolar relaxation. The name comes from a phenomenon predicted by Albert Overhauser in 1953, when he showed theoretically that saturating the electron magnetic resonance in a metal would cause the nuclear resonance intensity to be enhanced by a factor of the order of 103 (the ratio of "/electron/"/nucleus)- lonel Solomon later found that a similar effect occurs between two nuclei, but with a much smaller intensity enhancement—the nuclear Overhauser effect.90 Because the NOE is of great practical im-... 

Peculiarities of Electron Magnetic Resonance Spectra of the Linear Aggregates OF Ferromagnetic Nanoparticles... 

Keywords Electron Magnetic Resonance, Ferrofluids, Magnetite, Nanoparticles, Linear aggregates. 

Hoganson, C. W., Sahlin, M., Sj berg, B.-M., and Babcock, G. T., 1996, Electron magnetic resonance of the tyrosyl radical in ribonucleotide reductase from Escherichia coli. J. Am. Chem. Soc. 118 467294679. 

Electron spin resonance (ESR) spectroscopy, also known as electron paramagnetic resonance (EPR) or electron magnetic resonance, involves the absorption of microwave-frequency radiation by molecules, ions, or atoms possessing electrons with unpaired spins. More detailed accounts of the technique are provided by Atherton (1973), Symons (1978), and... 

B.S. Tsukerblat, Klokishner S.I., in Electron Magnetic Resonance of Disordered Systems, ed. by N.D. lordanov (World Scientific, Singapore, 1989), p. 319-337... 

Lanthanum strontium manganate, known also as LSM, is known for its magnetoresistance properties, and is also used in solid oxide fuel cells (SOFC). Sonochemistry was used for its preparation [121]. Electron magnetic resonance (EMR) spectra of nanosized sonochemically sintered powders of Lao.7Sro.3Mn03 (annealed, Tc = 340 K) were studied. 

---