Efficient long-term laser excitation of a collimated beam of potassium atoms on the D2 line A. Gopalan, E. Leber, J. Bömmels, S. P.H. Paul, M. Allegrini, M.-W. Ruf and H. Hotop Eur. Phys. J. D, 30 2 (2004) 163-169 Published online: 29 June 2004 DOI: 10.1140/epjd/e2004-00083-5