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Electronic spin and orbital (dd) excitation spectra of(Ca{x}La{1-x})(Ba{1.75-x}La{0.25+x})Cu{3}O{y} samples are measured by resonantinelastic x-ray scattering (RIXS). In this compound, Tc of samples withidentical hole dopings is strongly affected by the Ca/Ba substitution x due tosubtle variations in the lattice constants, while crystal symmetry and disorderas measured by line-widths are x independent. We examine two extreme values ofx and two extreme values of hole-doping content y corresponding toantiferromagnetic and superconducting states. The x dependence of the spin modeenergies is approximately the same for both the antiferromagnetic andsuperconducting samples. This clearly demonstrates that RIXS is sensitive to Jeven in doped samples. A positive correlation between the superexchange J andthe maximum of Tc at optimal doping Tc^{max} is observed. We also measured thex dependence of the d_{xy} -> d_{x^2-y^2} and d_{xz/yz} -> d_{x^2-y^2} orbitalsplittings. We infer that the effect of the unresolved d_{3z^2-r^2} ->d_{x^2-y^2} excitation on Tc^{max} is much smaller than the effect of J. Thereappears to be dispersion in the d_{xy} -> d_{x^2-y^2} peak of up to 0.05 eV.Our fitting of the peaks furthermore indicates an asymmetric dispersion for thed_{xz/yz} -> d_{x^2-y^2} excitation. A peak at ~0.8 eV is also observed, andattributed to a dd excitation in the chain layer.

Correlation of the Superconducting Critical Temperature with Spin and  Orbital Excitation Energies In (Ca{x}La{1-x})(Ba{1.75-x}La{0.25+x})Cu{3}O{y}  as Measured by Resonant Inelastic X-ray Scattering