Here we report electron paramagnetic resonance (EPR) study of rare-earth paramagnet CsGd(MoO). Multifrequency EPR measurements allowed us to directly probe the splitting of the lowestSmultiplet of Gdion and revealed the rhombic type of single-ion anisotropy. An easy-axis anisotropy approximation with a rhombic distortion of the Gdlocal environment describes obtained EPR spectra and yield energies ofSsplitting. Within this model, we discuss the configuration of the lowest Gdmultiplet, its zero-field splitting, and the anisotropy of magnetic properties in CsGd(MoO). We argue that the zero-field splitting ofSinduces a multiple structure of EPR spectra in CsGd(MoO).
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