Lifetime measurements in Gd II and Gd III using time-resolved laser spectroscopy Z. G. Zhang, A. Persson, Z. S. Li, S. Svanberg and Jiang Zhankui Eur. Phys. J. D, 13 3 (2001) 301-304 Published online: 15 March 2001 DOI: 10.1007/s100530170245