Experimental Studies Of The Nacs 5(3)Pi(0) And 1(A)(3)Sigma(+) States

We report high resolution measurements of 372 NaCs 5(3)Pi(0)(v, J) ro-vibrational level energies in the range 0 <= v <= 22. The data have been used to construct NaCs 5(3)Pi(0) potential energy curves using the Rydberg-Klein-Rees and inverted perturbation approximation methods. Bound-free 5(3)Pi(0)(v, J) -> 1(a)(3)Sigma(+) emission has also been measured, and is used to determine the repulsive wall of the 1(a)(3)Sigma(+) state and the 5(3)Pi(0) -> 1(a) (3)Sigma(+) relative transition dipole moment function. Hyperfine structure in the 5(3)Pi(0) state has not been observed in this experiment. This null result is explained using a simple vector coupling model. (C) 2012 American Institute of Physics. [ http://dx.doi.org/10.1063/1.3689388]