Author： Ramakrishna B.L. Manoharan P.T.
Publisher： Taylor & Francis Ltd
ISSN： 1362-3028
Source： Molecular Physics, Vol.52, Iss.1, 1984-05, pp. : 65-80
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Abstract
The observation of a single exchange-narrowed E.P.R. line in [NiCl 2 -(diars) 2 ]Cl, a monoclinic crystal with two magnetically inequivalent sites, is shown to be due to g -averaging and hence the concentration dependence of the g -tensor is explained. The lineshape analysis and the angular dependent linewidth data are used to evaluate various Fourier components of the spin-correlation function using Kubo-Tomita theory. The total linewidth is partitioned into secular and non-secular contributions of the broadening mechanisms—dipolar and hyperfine interactions. The angular dependence of the “10/3 effect” observed in X - and Q -bands could not be predicted by either the Blume-Hubbard or the Anderson-Weiss model. In the J regime [ ≈ 12 500 G or 3200 G > ≈ 700 G > dipolar , hyperfine ≈ 70 G] of [NiCl 2 (diars) 2 ]Cl there is paucity of both experimental and theoretical studies.
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