Oscillator strength measurements of the 3p ↦ nd Rydberg transitions of sodium M. A. Baig, S. Mahmood, M. A. Kalyar, M. Rafiq, N. Amin and S. U. Haq Eur. Phys. J. D, 44 1 (2007) 9-16 Published online: 04 May 2007 DOI: 10.1140/epjd/e2007-00147-0