Title: EPR lineshapes in polycrystalline samples: ions in axial and cubic crystal fields
Abstract: An analytical method for calculating absorption functions and EPR lineshapes from polycrystalline samples is given. These are expressed in closed form through an integral over only the angle φ A general expression is derived for samples where the spin Hamiltonian depends only on the polar angle Θ. The absorption functions and EPR lineshapes of 6S52 ions in randomly oriented axial and cubic fields are calculated. Expressions and criteria for extracting spectroscopic parameter values from the corresponding EPR spectra are derived and tested on the experimental spectra of Mn2+ and Fe3+ in polycrystalline calcite and magnesia, respectively. The calculated absorption functions are also used to interpret the EPR spectra of Mn2+ in different MgO powder samples. A numerical Monte Carlo technique for simulating absorption functions and EPR lineshapes from polycrystalline samples is described and used to compare the effect of the finite linewidth of the resonances from the crystallites, with that of distributed crystal field parameter values.
Publication Year: 1980
Publication Date: 1980-06-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 30
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