Abstract
Microwave absorption in CsMhC13·2H2O is studied in a wide range of frequencies, temperatures and magnetic fields. The temperature dependence of energy gaps in the AFMR spectrum is proportional to the sublattice magnetization up to 0.7 TN. In addition to AFMR, in the parallel polarized microwave and external magnetic fields \( \vec h\parallel \vec H \) the subthreshold two-magnon absorption bands of sum and difference types are observed in the external field for different orientations. The temperature and frequency dependences of these bands are studied. Energy of the weak interchain exchange interaction is estimated.
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