A beam of <sup>7</sup>Li<sup>+</sup> ions accelerated to 56 keV by an electromagnetic isotope separator was directed through a thin carbon foil. The emergent ions were in various charge and excitation states, from which 26 spectral lines of Li I and Li II were identified. The decay times of eight stronger lines were measured in order to determine the mean lives of upper levels involved in the decays.
WILLIAM S. BICKEL, I. MARTINSON, L. LUNDIN, R. BUCOITA, J. BROMANDER, and I. BERGSTRÖM, "Mean Lives of Some Excited Levels of Li I and Li II," J. Opt. Soc. Am. 59, 830-833 (1969)