References. [1] Calculations by model potential method (Miculis & Meyer 2005); [2] beam-gas-laser spectroscopy (Volz et al. 1996); [3] precision spectroscopy on an optically prepared sample of ultracold, two-level atoms (Oates et al. 1996); [4] molecular spectroscopy of the Na₂ purely long-range state  (Jones et al. 1996); [5] numerical Coulomb approximation (Lindgård & Nielsen 1977); [6] measurements by molecular beam method (Tiemann et al. 1996); [7] realistic calculations including the core polarization, spin-orbit interaction, and blackbody radiation (Theodosiou 1984); [8] observing the decay in flight of laser-excited atoms in a fast atomic beam  (Gaupp et al. 1982); [9] multiconfiguration Hartree-Fock calculations (Carlsson et al. 1992); [10] detecting the time-resolved fluorescence from the directly populated levels by the delayed-coincidence technique (Marek 1977); [11] multiconfiguration Hartree-Fock calculations (Jönsson et al. 1996); [12] measurements by stepwise excitation of a fast ion beam (Kandela 1984); [13] direct oscillography of the time dependence of light emitted from Na atoms, excited by short pulses of electrons (Karstensen & Schramm 1966); [14] time resolved observations of the fluorescence radiation after stepwise excitation by two pulsed dye lasers (Kaiser 1975).