Several non-centrosymmetric heavy-fermion compounds have been reported to exhibit unconventional superconductivity (SC). For example, both CeRhSi3 and CeIrSi3 order antiferromagnetically at ambient pressure, but show SC under applied pressure. Other isostructural cerium compounds do not show SC and several behave like localized antiferromagnets, with well defined crystalline electric field (CEF) excitations. CePdSi3 displays two antiferromagnetic transitions at 5.2 K and 3 K and we wish to measure the scattering on MERLIN with 2 incident energies. We will make detailed measurements to fit the data to a CEF model and to measure the degree 4f hybridization. We will also measure the intermediate valence compound CeRuSi3, to look at the broad excitation and to estimate the Kondo temperature. These will aid understanding of the role of magnetism in the SC of this family of compounds.