Lifetime measurements in Tm I, Tm II, and Tm III by time-resolved laser spectroscopy H.-L. Xu, Z.-K. Jiang and S. Svanberg Eur. Phys. J. D, 23 3 (2003) 323-326 Published online: 04 March 2003 DOI: 10.1140/epjd/e2003-00055-3