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Quantitative Analysis of EPR Spectra of Powdered Samples Containing a Mixture of Various Paramagnetic Particles

✍ Scribed by P. Pelikán; M. Liška; M. Valko; M. Mazúr


Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
169 KB
Volume
122
Category
Article
ISSN
1064-1858

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✦ Synopsis


The prevailing majority of EPR spectra in solid samples concern ESEEM spectra simulation and optimization were published the randomly oriented paramagnetic particles in solids (polycrysby Keijzers et al. (8). The procedures of EPR spectra optimitalline samples, powders, glasses, ceramics, frozen solutions). In zation of randomly oriented radicals in the solid state and these cases it is necessary to provide numerical simulation or nonthe procedure of spectra decomposition for the mixture of linear optimization of the spin-Hamiltonian parameters to obtain various paramagnetic particles in the same sample are not the relevant physical results. The presence of various paramagincluded in those programs. A compilation of EPR software netic particles in the same sample often complicates the situation.

has been made (9), which contains more than 30 programs This paper deals with the numerical solution to these problems.

(although many more may exist). In a very interesting recent

Illustrative examples of EPR spectroscopy of radiation-induced paper (10), the maximum-likelihood common-factor analyparamagnetic centers in glasses and EPR of Cu(II) as a spin label sis of EPR spectra decomposition of randomly oriented radiin the study of the thermal evolution of SiO 2 gel preparation are also presented. ᭧ 1996 Academic Press, Inc. cals in the solid state is utilized. The method provides a way of determining the correct number of individual constituents in a series of similar samples. In combination with a target transformation using a minimization procedure, this method


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