Limitations of the strong field approximation in ionization of the hydrogen atom by ultrashort pulses

We present a theoretical study of the ionization of hydrogen atoms as a result of the interaction with an ultrashort external electric field. Doubly-differential momentum distributions and angular momentum distributions of ejected electrons calculated in the framework of the Coulomb-Volkov and stron...

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Autores principales: Arbó, Diego Gabriel, Miraglia, Jorge Esteban
Publicado: 2009
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14346060_v51_n3_p303_Arbo
http://hdl.handle.net/20.500.12110/paper_14346060_v51_n3_p303_Arbo
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spelling paper:paper_14346060_v51_n3_p303_Arbo2023-06-08T16:15:30Z Limitations of the strong field approximation in ionization of the hydrogen atom by ultrashort pulses Arbó, Diego Gabriel Miraglia, Jorge Esteban We present a theoretical study of the ionization of hydrogen atoms as a result of the interaction with an ultrashort external electric field. Doubly-differential momentum distributions and angular momentum distributions of ejected electrons calculated in the framework of the Coulomb-Volkov and strong field approximations, as well as classical calculations are compared with the exact solution of the time dependent Schr ödinger equation. We show that in the impulsive limit, the Coulomb-Volkov distorted wave theory reproduces the exact solution. The validity of the strong field approximation is probed both classically and quantum mechanically. We found that classical mechanics describes the proper quantum momentum distributions of the ejected electrons right after a sudden momentum transfer, however pronounced the differences at latter stages that arise during the subsequent electron-nucleus interaction. Although the classical calculations reproduce the quantum momentum distributions, it fails to describe properly the angular momentum distributions, even in the limit of strong fields. The origin of this failure can be attributed to the difference between quantum and classical initial spatial distributions. © 2008 EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg. Fil:Arbó, D.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Miraglia, J.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2009 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14346060_v51_n3_p303_Arbo http://hdl.handle.net/20.500.12110/paper_14346060_v51_n3_p303_Arbo
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description We present a theoretical study of the ionization of hydrogen atoms as a result of the interaction with an ultrashort external electric field. Doubly-differential momentum distributions and angular momentum distributions of ejected electrons calculated in the framework of the Coulomb-Volkov and strong field approximations, as well as classical calculations are compared with the exact solution of the time dependent Schr ödinger equation. We show that in the impulsive limit, the Coulomb-Volkov distorted wave theory reproduces the exact solution. The validity of the strong field approximation is probed both classically and quantum mechanically. We found that classical mechanics describes the proper quantum momentum distributions of the ejected electrons right after a sudden momentum transfer, however pronounced the differences at latter stages that arise during the subsequent electron-nucleus interaction. Although the classical calculations reproduce the quantum momentum distributions, it fails to describe properly the angular momentum distributions, even in the limit of strong fields. The origin of this failure can be attributed to the difference between quantum and classical initial spatial distributions. © 2008 EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg.
author Arbó, Diego Gabriel
Miraglia, Jorge Esteban
spellingShingle Arbó, Diego Gabriel
Miraglia, Jorge Esteban
Limitations of the strong field approximation in ionization of the hydrogen atom by ultrashort pulses
author_facet Arbó, Diego Gabriel
Miraglia, Jorge Esteban
author_sort Arbó, Diego Gabriel
title Limitations of the strong field approximation in ionization of the hydrogen atom by ultrashort pulses
title_short Limitations of the strong field approximation in ionization of the hydrogen atom by ultrashort pulses
title_full Limitations of the strong field approximation in ionization of the hydrogen atom by ultrashort pulses
title_fullStr Limitations of the strong field approximation in ionization of the hydrogen atom by ultrashort pulses
title_full_unstemmed Limitations of the strong field approximation in ionization of the hydrogen atom by ultrashort pulses
title_sort limitations of the strong field approximation in ionization of the hydrogen atom by ultrashort pulses
publishDate 2009
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14346060_v51_n3_p303_Arbo
http://hdl.handle.net/20.500.12110/paper_14346060_v51_n3_p303_Arbo
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AT miragliajorgeesteban limitationsofthestrongfieldapproximationinionizationofthehydrogenatombyultrashortpulses
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