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A form for the relaxation shape function for a Heisenberg paramagnet is proposed which has the merit of satisfying certain sum rules and limits. It is shown by comparison with exact infinite-temperature calculations by Carboni and Richards, and inelastic neutron scattering measurements by Hutchings et al. on (CD₃)₄NMnCl₃, to provide a very good description of an antiferromagnetic linear chain at all temperatures.
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Lovesey et al. (1972) studied this question.
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