Lifetimes of vibrational levels in the range of 22 to 57 of the excited state of the sodium dimer (Na2) have been calculated, and they compare favorably to experimental values. Experimental values are recorded in a molecular beam using resonance excitation followed by a variably delayed ionization using a 532 nm photon. The 21Σu+ state is connected by allowed dipole emission to the 31g+, 11g, 21g+, and X(1)1g+ states. Bound-bound and bound-free transition probabilities are performed using the freely available Level and BCont programs provided by R. J. Le Roy. A comparison between the calculated (theory) and experimental lifetime values is shown in Fig. 1. In this talk I will present the experimental and computational techniques used to determine the lifetimes of the 21Σu+. Preliminary lifetime data of the state of will be presented.