Wave-packet analysis of strong-field ionization of sodium in the quasistatic regime Andrej Bunjac, Duška B. Popović and Nenad S. Simonović Eur. Phys. J. D, 70 5 (2016) 116 Published online: 24 May 2016 DOI: 10.1140/epjd/e2016-60738-0