## Franck-Condon factors and potential curves for the combining states of the cesium dimer A {sup 1}{Sigma}{sup +}{sub u} - X{sup 1}{Sigma}{sup +}{sub g} transition

It is shown that the actual Cs{sub 2} ground and first excited state potentials are better approximated by the Rydberg-Klein-Rees potential curve than by the Morse, Hulburt-Hirschfelder, Dunham, and perturbed Morse potentials. The Franck-Condon factors for the Cs{sub 2}A-X transition (O {le}{upsilon}{prime}{le}35; 0 {le}{upsilon}{double_prime}{le}22) are calculated for the Rydberg,-Klein-Rees potential curves. The results of the calculations were used to determine the oscillator strength for the A-X transition of the Cs{sub 2} molecule.