摘要: Recent advances in tunable laser sources have stimulated a great deal of interest the study intense field-matter interaction physics. Whenever molecule interacts with an radiation field, it can absorb multiple photons from field and make transition either to excited state (excitation) or into continuum (ionization). If energy integral number equals difference between initial state, multiphoton process becomes resonant its probability is greatly enhanced. The observation such enhanced processes requires considerably less intensity than that required for non-resonant processes. Several researchers taken advantage this resonance enhancement various aspects ionization (REMPI) molecules.1 Measurement ionic photoelectron spectra illustrated features as non-Franck-Condon effects vibrational branching ratios due autoionization,2 shape resonances3 Cooper minima,4 non-atomic Rydberg states5 competition rotational autoionization.6
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