New observation and combined analysis of the Cs2 0g-, 0u+, and 1g states at the asymptotes 6S1/2+6P1/2 and 6S1/2+6P3/2

We report on new observations of the photoassociation spectroscopy of ultracold cesium molecules using a highly sensitive detection technique and a combined analysis with all observed electronic states. The technique is achieved by directly modulating the frequency of the trapping lasers of a magneto-optical trap. New observations of the Cs-2 0(g)(-), 0(u)(+), and 1(g) states at the asymptotes 6S(1/2) + 6P(1/2) and 6S(1/2) + 6P(3/2) are reported. The spectral range is extended to the red detuning of 112 cm(-1) belowthe 6S(1/2) + 6P(3/2) dissociation limit. Dozens of vibrational levels of the ultracold Cs-2 0(g)(-), 0(u)(+), and 1(g) states are observed for the first time. The available experimental binding energies of these states are analyzed simultaneously in a framework of the generalized LeRoy-Bernstein theory and the almost degenerate perturbation theory by Marinescu and Dalgarno [Phys. Rev. A: At., Mol., Opt. Phys. 52, 311 (1995)]. The unique atomic-related parameter c(3) governing the dispersion forces of all the molecular states is estimated as (10.29 +/- 0.05) a.u. (c) 2014 AIP Publishing LLC.