Two-color pump-probe experiments in helium using high-order harmonics A. Johansson, M. K. Raarup, Z. S. Li, V. Lokhnygin, D. Descamps, C. Lyngå, E. Mevel, J. Larsson, C.-G. Wahlström, S. Aloise et al. (3 more) Eur. Phys. J. D, 22 1 (2003) 3-11 Published online: 22 October 2002 DOI: 10.1140/epjd/e2002-00213-1