Abstract
A high-resolution inelastic neutron scattering experiment has been carried out in the \ensuremath{\alpha} and \ensuremath{\mathrm{B}} low-temperature phases of solid oxygen. Direct comparison between the spectra of both phases as well as with previous experiments and lattice dynamics calculations, allow one to identify a feature appearing at \ensuremath{\approx} 4.3 meV in the low Q region of the spectra as arising from the antiferromagnetic excitations, the existence of which had been postulated from optical work.
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