Spectroscopy of the a3Σu+ state and the coupling to the X1Σg+ state of K2 A. Pashov, P. Popov, H. Knöckel and E. Tiemann Eur. Phys. J. D, 46 2 (2008) 241-249 Published online: 14 November 2007 DOI: 10.1140/epjd/e2007-00307-2