Influence of the Fine and Hyperfine Structure Terms on the Electron Paramagnetic Resonance Spectra of Polycrystalline Solids

Autor:	J.-Cl. Bissey, René Berger, Pierre Béziade, Y. Servant, J. Lissayou
Rok vydání:	1993
Předmět:	chemistry.chemical_classification chemistry law Physical chemistry Crystallite Condensed Matter Physics Electron paramagnetic resonance Hyperfine structure Inorganic compound Spectral line Electronic Optical and Magnetic Materials law.invention Nuclear chemistry
Zdroj:	physica status solidi (b). 177:501-505
ISSN:	1521-3951 0370-1972
DOI:	10.1002/pssb.2221770226
Popis:	EPR spectra of polycrystalline compounds MnSO4 · (NH4)2SO4 · 6H2O, Gd2(SO4)3 · 8H2O, and NH4Fe(SO4)2 · 12H2O are recorded at X-band and room temperature. For the first two compounds, good agreement with simulated spectra of Gaussian lineshape is found, and the numerical values of the fine (D) and hyperfine (A) structure constants are obtained by fitting with experimental spectra. For the last compound, the fine structure characteristic of the cubic term (a) is responsible for the “hyper-Gaussian” shape of the EPR line. Les spectres de RPE des composes polycristallins MnSO4 · (NH4)2SO4 · 6H2O, Gd2(SO4)3 · 8H2O et NH4Fe(SO4)2 · 12H2O sont enregistres en bande X et a temperature ambiante. Pour les deux premiers composes nous trouvons un bon accord avec les spectres d'absorption simules de forme gaussienne et l'ajustement avec les spectres experimentaux a donne les valeurs des constantes de structure fine D et hyperfine A. Pour le dernier compose etudie, c'est la structure fine carac-teristique d'un terme cubique (a) qui est responsable de la forme hyper-gaussienne du spectre d'absorption.
Databáze:	OpenAIRE
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