This book presents the latest developments and issues in both experimental and theoretical studies of multi-photon processes and the spectroscopy of atoms, ions and molecules in physics, chemistry, biology and material science. It contains review papers suitable for both active researchers and non-experts who wish to enter the field.

Special attention is paid to the recent progress of non-linear photon matter interactions in atoms, molecules and interfaces: XUV/soft X-ray, high-order harmonic generation in attosecond regime, high-order harmonic generation, sum frequency generation, four-wave mixing spectroscopy and molecular orientation with combined electrostatic and intense, non-resonant laser fields.

Contents: Nonlinear Optics for Characterizing XUV/Soft X-Ray High-Order Harmonic Fields in Attosecond Regime (Y Nabekawa & K Midorikawa); Signatures of Molecular Structure and Dynamics in High-Order Harmonic Generation (M Lein & C C Chiril ); Molecular Manipulation Techniques and Their Applications (H Sakai); Sum Frequency Generation: An Introduction with Recent Developments and Current Issues (M J Shultz); Propagation and Intramolecular Coupling Effects in Four-Wave Mixing Spectroscopy (J L Paz); Control of Molecular Chirality by Lasers (K Hoki & Y Fujimura).