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We present experimentally derived potential curves and spin-orbit interactionfunctions for the strongly perturbed $A^{1}\Sigma_{u}^{+}$ and $b^{3}\Pi_{u}$states of the cesium dimer. The results are based on data from several sources.Laser-induced fluorescence Fourier transform spectroscopy (LIF FTS) was usedsome time ago in the Laboratoire Aim\'{e} Cotton primarily to study the $X^{1}\Sigma_{g}^{+}$ state. More recent work at Tsinghua University providesinformation from moderate resolution spectroscopy on the lowest levels of the$b^{3}\Pi_{0u}^{\pm}$ states as well as additional high resolution data. FromInnsbruck University, we have precision data obtained with cold Cs$_{2}$molecules. Recent data from Temple University was obtained using theoptical-optical double resonance polarization spectroscopy technique, andfinally, a group at the University of Latvia has added additional LIF FTS data.In the Hamiltonian matrix, we have used analytic potentials (the Expanded MorseOscillator form) with both finite-difference (FD) coupled-channels and discretevariable representation (DVR) calculations of the term values. Fitted diagonaland off-diagonal spin-orbit functions are obtained and compared with {\it abinitio} results from Temple and Moscow State universities.

Global analysis of data on the spin-orbit coupled $A^{1}\Sigma_{u}^{+}$ and $b^{3}\Pi_{u}$ states of Cs2