Electron spin resonance parameters

Electron Spin Resonance Parameters for the Stable Group IV Tris(alkyl) and Tris(amido) Radicals 1... 

Volume 21, Part C, is concerned with electronic and transport properties, including investigative techniques employing field effect, capacitance and deep level transient spectroscopy, nuclear and optically detected magnetic resonance, and electron spin resonance. Parameters and phenomena considered include electron densities, carrier mobilities and diffusion lengths, densities of states, surface effects, and the Staebler-Wronski effect. 

Abstract This tribute to the work by Carl Johan Ballhausen focuses on the emergence of quantitative means for the study of the electronic properties of complexes and molecules. Development, refinement, and application of the orbital picture elucidated electric and magnetic features of ranges of molecules when used for the interpretation of electronic transitions, electron spin resonance parameters, rotatory dispersion, nuclear quadrupole couplings as well as geometric bonding patterns. Ballhausen s profound impact on the field cannot be overestimated. 

The electron spin-resonance parameters gi, gx. A, B, and one P for a number of rare earths in YVO4 have been reported (Ranon, 1968a, b). The Schottky specific heat, paramagnetic susceptibility, and quadrupole splitting have been calculated for Tm YV04 using results from optical measurements and sub-... 

H. M. Quiney, P. Belanzoni. Relativistic calculation of hyperfine and electron spin resonance parameters in diatomic molecules. Chem. Phys. Lett., 353 (2002) 253-258. 

H. U. Suter and B. Engels, J. Chem. Phys., 100, 2936 (1993). Theoretical Study of the Electron Spin Resonance Parameters H2CN and H2CO". ... 

FIGURE 17.11 Prof. James F. Harrison of the Michigan State University Chemistry Department carried out early calculations on the excited states of molecules using accurate configuration interaction methods, particularly BH [27] under the direction of his advisor Prof Leland C. Allen at Princeton University. He was one of the first to use accurate computational methods to study the triplet methylene molecule CH2 which is very important in synthetic organic chemistry. In particular, his calculation of the electron spin resonance parameters of CH2 was a rare case of computational theory guiding experimental spectroscopy at a time in the history of quantum chemistry that estabhshed the credibility of such calculations. He is also a contributor to Chapters 16 and 17. 

By using this technique acrylamide, acrylonitrile, and methyl acrylate were grafted onto cellulose [20]. In this case, oxidative depolymerization of cellulose also occurs and could yield short-lived intermediates [21]. They [21] reported an electron spin resonance spectroscopy study of the affects of different parameters on the rates of formation and decay of free radicals in microcrystalline cellulose and in purified fibrous cotton cellulose. From the results they obtained, they suggested that ceric ions form a chelate with the cellulose molecule, possibly, through the C2 and C3 hydroxyls of the anhy-droglucose unit. Transfer of electrons from the cellulose molecule to Ce(IV) would follow, leading to its reduction... 

Edwards two-parameter equation 549 Electrochemical oxidation of sulphides 76, 252, 253 of sulphoxides 968, 987, 1043 Electrochemical reduction of sulphones 962, 963, 1002-1041 of sulphoxides 933, 1041, 1042 Electronegativity, of the sulphur atom 584 Electronic effects 390, 484-535 Electron scavengers 892, 896 Electron spin resonance spectroscopy 874, 890-895, 1050-1055, 1082, 1083, 1090-1093... 

The next stage, which we ought to try to reach as soon as possible, is that of measurement of physical parameters of the systems so as to relate hot atom chemistry to other areas of physical chemistry. Here one would think immediately of the possible use of electron spin resonance to observe the existence and stability of the various radical species which have been postulated or inferred to occur in several systems -Cr(CO)j., Mn(CO)5, -FeCp, As 2> others. One might... 

More advanced scale was proposed by Kamlet and Taft [52], This phenomenological approach is very universal as may be successfully applied to the positions and intensities of maximal absorption in IR, NMR (nuclear magnetic resonance), ESR (electron spin resonance), and UV-VS absorption and fluorescence spectra, and to many other physical or chemical parameters (reaction rates, equilibrium constant, etc.). The scale is quite simple and may be presented as ... 

A comprehensive discussion and illustrations of the effects of spectrometer operating parameters on ESR spectra are given by the author in Electron spin resonance, in Physical Methods of Chemistry, ed. A. Weissberger and B. W. Rossiter, John Wiley and Sons, Inc., New York, 1972, part IIIA, ch. VI,. 

Electron spin resonance (ESR) studies of the urazole-bridged 1,3 diradicals 64 derived from the azoalkanes 63 confirm a triplet ground state for these species. The nearly zero symmetry parameter, that is, Elhc= 0.0004 0.0001 cm-1, for the triplet diradical 64 of the diphenyl azoalkane 63 establishes a planar conformation <1995JOC308, 1997JA10673>. 

Electrochemistry, organic, structure and mechanism in, 12, 1 Electrode processes, physical parameters for the control of, 10, 155 Electron donor-acceptor complexes, electron transfer in the thermal and photochemical activation of, in organic and organometallic reactions. 29, 185 Electron spin resonance, identification of organic free radicals, 1, 284 Electron spin resonance, studies of short-lived organic radicals, 5, 23 Electron storage and transfer in organic redox systems with multiple electrophores, 28, 1 Electron transfer, 35, 117... 

Electron spin resonance (ESR) measures the absorption spectra associated with the energy states produced from the ground state by interaction with the magnetic field. This review deals with the theory of these states, their description by a spin Hamiltonian and the transitions between these states induced by electromagnetic radiation. The dynamics of these transitions (spin-lattice relaxation times, etc.) are not considered. Also omitted are discussions of other methods of measuring spin Hamiltonian parameters such as nuclear magnetic resonance (NMR) and electron nuclear double resonance (ENDOR), although results obtained by these methods are included in Sec. VI. 

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