Abstract
Above-threshold ionization (ATI) in atoms produces highly structured electron spectra, consisting of one or more series of regularly spaced narrow energy peaks. Most low-energy (less than 10 eV) features of these spectra "have "been successfully explained by considering the dynamics of a single active electron wave packet driven by the laser field in the presence of a static ion potential.1 The narrow peaks are enhancements that occur when an excited state Stark shifts into multiphoton resonance with the laser.2
© 1997 Optical Society of America
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