Multiphoton Ionization of Atomic Hydrogen Using Perturbation Theory

摘要: Publisher Summary This chapter discusses multiphoton ionization of atomic hydrogen using perturbation theory. As atoms possess discrete negative energy spectra, there are nonresonant and resonance-enhanced processes. In the case ionization, no intermediate states have same as in spectrum. When one or more coincide with states, has process. strong fields may absorb not only minimum energetically necessary number photons but also excess photons. One-step process which extra absorbed is called above-threshold (ATI). The converted entirely into kinetic emitted electron. Therefore photoelectron spectra must be studied, became possible development methods spectroscopy very high resolution. ATI by monochromatic light spectrum photoelectrons consists equally spaced peaks. Sturmian transition matrix elements for presented. method analytical continuation an photon first described detail.