EPR of manganese-containing plasticine: Spectral simulation and use as an internal standard for comparison of the signal intensities of various free-radical EPR spectra |
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Authors: | P Rahimi-Moghaddam Y Upadrashta M J Nilges and J A Weil |
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Institution: | (1) Research Department, Danish Meteorological Institute, Lyngbyvej 100, 2100 Copenhagen, Denmark |
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Abstract: | Electron paramagnetic resonance spectra of manganese-containing plasticine putty have been obtained both at 9.4 and 94.2 GHz
(room temperature). It has been possible to analyze both, quantitatively by computer-based simulation and exact diagonalization
of a general spin-Hamiltonian, by use of an appropriate powder technique. A fine fit was obtained for both frequencies with
an isotropicg-2.00117, uniaxial55Mn hyperfine valuesA
∥/g
c
β
c = −93.5 G (where ‖ implies direction (ℤ) andA
⊥/g
c
β
c = −94.3 G, a nuclear quadrupole effectP
z(55Mn)=0, and a uniaxial electronic quadrupole matrix (D/g
c
β
c = 3D
Z/2g
c
β
c = −82.8 G). The electronic octupole energy was taken into account via the single parameterB
40/g
c
β
c = −0.024 G. The plasticine has been demonstrated to afford a fine intensity and magnetic-field standard, say, for use with
free radicals such as spin-trap adducts. Examples provided are 2,2-diphenyl-l-picrylhydrazyl, and hydroxyl radical generated
by the Fenton reaction and spin-trapped with 5,5-dimethyl-1-pyroline-N-oxide. |
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Keywords: | |
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