IFISUR   23398
INSTITUTO DE FISICA DEL SUR
Unidad Ejecutora - UE
artículos
Título:
Benchmark for two-photon ionization of atoms with generalized Sturmian functions
Autor/es:
GÓMEZ, ANTONIO I.; AMBROSIO, MARCELO J.; MITNIK, DARÍO M.; GASANEO, GUSTAVO; ANCARANI, LORENZO U.
Revista:
EUROPEAN PHYSICAL JOURNAL D
Editorial:
SPRINGER
Referencias:
Lugar: Berlin; Año: 2016 vol. 70 p. 207 - 218
ISSN:
1434-6060
Resumen:
The description with traditional methods of the single or multiple ionization of atoms and molecules by two or more successive photons requires some special treatment. Difficulties occur when a spatially non-decaying driven term appears in the Schr¨odinger?like non-homogeneousequation for the scattering wave function. We propose using the intrinsic physical and mathematical properties of generalized Sturmian functions to efficiently deal with the Dalgarno-Lewis second order equation. In contrast to other approaches, our methodology provides a practical way to extract the transition amplitude from the asymptotic behavior of the scattering wave function, and this without requiring any further projection onto some final approximate state. As an illustration,the hydrogen case is studied in details, for both pulsed and monochrome laser radiation fields. The successful comparison with analytical and time-dependent solutions provides a benchmark, and allows us to master the numerical aspects of the methodology. Appropriately chosen generalizedSturmian functions manage to easily reproduce the beat?type asymptotic behavior observed in the photoelectron wave function after absorption by the atom of two successive photons.