Title Advances in multi-photon processes and spectroscopy. Volume 21 / edited by S.H. Lin, National Chiao-Tung University, Taiwan, Institute of Atomic and Molecular Sciences, Taiwan and Arizona State University, USA, A.A. Villaeys, Institute de Physique et Chimie des Materiaux de Strasbourg, France, Y. Fujimura, Tohoku University, Japan.