The R-Matrix-Floquet Theory of Multiphoton Processes
The R-matrix-Floquet theory1 enables the interaction of intense laser fields with complex atoms and ions to be studied in a fully non-perturbative manner. In particular it has been used to study multiphoton ionization, laser-assisted electron-atom scattering, harmonic generation and multiphoton processes involving two incommensurate frequencies. Taking advantage of R-matrix theory the method is able to represent the atomic structure accurately and so, for example, the role of resonances in the ionization process can be studied in detail. This has permitted a wide range of atoms and negative ions to be considered including H, H-, He, Ne, Ar, Mg, F-, Cl- and Li-. As well as yielding total ionization rates, partial rates and angular distributions the R-matrix-Floquet approach has enabled other phenomena to be considered. Of particular interest here has been the study of laser-induced degenerate states (LIDS) such as those found in Ar2,3. An example of a LIDS process will be considered below.
KeywordsMultiphoton Ionization Autoionizing State Multiphoton Process Intense Laser Field Photodetachment Cross Section
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