Abstract
We performed an inelastic neutron scattering experiment to study the magnetic excitation of O 2 molecules adsorbed in a microporous compound. A dispersionless excitation with characteristic intensity modulation is observed at \(\hbar\omega = 7.8\) meV at low temperature. The neutron cross section is explained by using a spin dimer model with an intradimer distance of 3.1 A. Anomalous behaviour in the temperature dependence is discussed in the context of enhanced magnetoelasticity in the soft framework of the O 2 molecule.
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