The dissociation energy of the cesium dimer

Dye laser excitation of the recently discovered D¹ ∑⁺_u←X¹∑⁺_g system of Cs₂ yields extended flurescence progressions ranging from ν″ = 0 to ν″ = 140. Analysis of the fluorescence spectra and application of the LeRoy-Bernstein method to determine the dissociation limit results in a dissociation energy off D_e = 3648 ± 8 cm^?1, more than one order of magnitude more accurate than previously known.