A new precise value of the absolute 23S1, F = 5/2-23P2, F = 7/2 transition frequency in 7Li+ H. Rong, S. Grafström, J. Kowalski, R. Neumann and G. zu Putlitz Eur. Phys. J. D, 3 3 (1998) 217-222 Published online: 15 September 1998 DOI: 10.1007/PL00021586