Time-dependent Feshbach method to study resonant photoionization of He with ultrashort laser pulses

ABSTRACT: A time-dependent Feshbach formalism is proposed to study the resonant photoionization of the helium atom using ultrashort laser pulses. This spectral method consist in solving the time-dependent Schr¨odinger equation by expanding the time-dependent wavepacket in terms of eigenfunctions def...

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Autores:
Granados Castro, Carlos Mario
Sanz Vicario, José Luis
Tipo de recurso:
Article of investigation
Fecha de publicación:
2014
Institución:
Universidad de Antioquia
Repositorio:
Repositorio UdeA
Idioma:
eng
OAI Identifier:
oai:bibliotecadigital.udea.edu.co:10495/9326
Acceso en línea:
http://hdl.handle.net/10495/9326
Palabra clave:
Método de Feshbach
Fotoionización
Lásers
Lasers
Rights
openAccess
License
Atribución-NoComercial-SinDerivadas 2.5 Colombia
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oai_identifier_str oai:bibliotecadigital.udea.edu.co:10495/9326
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repository_id_str
dc.title.spa.fl_str_mv Time-dependent Feshbach method to study resonant photoionization of He with ultrashort laser pulses
title Time-dependent Feshbach method to study resonant photoionization of He with ultrashort laser pulses
spellingShingle Time-dependent Feshbach method to study resonant photoionization of He with ultrashort laser pulses
Método de Feshbach
Fotoionización
Lásers
Lasers
title_short Time-dependent Feshbach method to study resonant photoionization of He with ultrashort laser pulses
title_full Time-dependent Feshbach method to study resonant photoionization of He with ultrashort laser pulses
title_fullStr Time-dependent Feshbach method to study resonant photoionization of He with ultrashort laser pulses
title_full_unstemmed Time-dependent Feshbach method to study resonant photoionization of He with ultrashort laser pulses
title_sort Time-dependent Feshbach method to study resonant photoionization of He with ultrashort laser pulses
dc.creator.fl_str_mv Granados Castro, Carlos Mario
Sanz Vicario, José Luis
dc.contributor.author.none.fl_str_mv Granados Castro, Carlos Mario
Sanz Vicario, José Luis
dc.subject.none.fl_str_mv Método de Feshbach
Fotoionización
Lásers
Lasers
topic Método de Feshbach
Fotoionización
Lásers
Lasers
description ABSTRACT: A time-dependent Feshbach formalism is proposed to study the resonant photoionization of the helium atom using ultrashort laser pulses. This spectral method consist in solving the time-dependent Schr¨odinger equation by expanding the time-dependent wavepacket in terms of eigenfunctions defined in two orthogonal halfspaces: a bound-like resonant Q and a non-resonant scattering-like P. The latter eigenfunctions for the projected Hamiltonians QHQ and PHP are not indeed eigenfunctions of the total Hamiltonian, so that the electrostatic coupling QHP acts as a leaking operator Q→P responsible for the temporal decay of resonances into the underlying continuum, keeping the physical insight of the Fano-Feshbach time independent formalisms. This method allows not only for accurate descriptions of the resonance parameters (energies, widths and Fano shape parameters) but also for the temporal evolution of the photodynamics involved in the resonant photoionization when using short laser pulses. We illustrate the performance of the method by analyzing the temporal formation of i) the one-photon ionization cross section below the second ionization threshold and the buildup of Fano profiles and ii) the up-down asymmetry of photoelectron angular distributions resulting from interferences of S-, P- and D-waves after simultaneous photoexcitation and decay of the lowest 1Se, 1Po and 1De resonant states, by using two sequential laser pulses with XUV harmonic frequencies separated by a time delay.
publishDate 2014
dc.date.issued.none.fl_str_mv 2014
dc.date.accessioned.none.fl_str_mv 2018-04-05T19:27:31Z
dc.date.available.none.fl_str_mv 2018-04-05T19:27:31Z
dc.type.spa.fl_str_mv info:eu-repo/semantics/article
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dc.identifier.citation.spa.fl_str_mv Granados Castro, C. M., & Sanz Vicario, J. L. (2014). Time-dependent Feshbach method to study resonant photoionization of He with ultrashort laser pulses. Journal of Physics: Conference Series. 488(012018), 1-6. DOI:10.1088/1742-6596/488/1/012018
dc.identifier.issn.none.fl_str_mv 1742-6596
dc.identifier.uri.none.fl_str_mv http://hdl.handle.net/10495/9326
dc.identifier.doi.none.fl_str_mv 10.1088/1742-6596/488/1/012018
dc.identifier.eissn.none.fl_str_mv 1742-6588
identifier_str_mv Granados Castro, C. M., & Sanz Vicario, J. L. (2014). Time-dependent Feshbach method to study resonant photoionization of He with ultrashort laser pulses. Journal of Physics: Conference Series. 488(012018), 1-6. DOI:10.1088/1742-6596/488/1/012018
1742-6596
10.1088/1742-6596/488/1/012018
1742-6588
url http://hdl.handle.net/10495/9326
dc.language.iso.spa.fl_str_mv eng
language eng
dc.relation.ispartofjournalabbrev.spa.fl_str_mv J. Phys.:Conf.Ser
dc.rights.*.fl_str_mv Atribución-NoComercial-SinDerivadas 2.5 Colombia
dc.rights.spa.fl_str_mv info:eu-repo/semantics/openAccess
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rights_invalid_str_mv Atribución-NoComercial-SinDerivadas 2.5 Colombia
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eu_rights_str_mv openAccess
dc.format.mimetype.spa.fl_str_mv application/pdf
dc.publisher.spa.fl_str_mv Institute of Physics Publishing (IOP)
dc.publisher.group.spa.fl_str_mv Grupo de Física Atómica y Molecular
dc.publisher.place.spa.fl_str_mv Reino Unido
institution Universidad de Antioquia
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spelling Granados Castro, Carlos MarioSanz Vicario, José Luis2018-04-05T19:27:31Z2018-04-05T19:27:31Z2014Granados Castro, C. M., & Sanz Vicario, J. L. (2014). Time-dependent Feshbach method to study resonant photoionization of He with ultrashort laser pulses. Journal of Physics: Conference Series. 488(012018), 1-6. DOI:10.1088/1742-6596/488/1/0120181742-6596http://hdl.handle.net/10495/932610.1088/1742-6596/488/1/0120181742-6588ABSTRACT: A time-dependent Feshbach formalism is proposed to study the resonant photoionization of the helium atom using ultrashort laser pulses. This spectral method consist in solving the time-dependent Schr¨odinger equation by expanding the time-dependent wavepacket in terms of eigenfunctions defined in two orthogonal halfspaces: a bound-like resonant Q and a non-resonant scattering-like P. The latter eigenfunctions for the projected Hamiltonians QHQ and PHP are not indeed eigenfunctions of the total Hamiltonian, so that the electrostatic coupling QHP acts as a leaking operator Q→P responsible for the temporal decay of resonances into the underlying continuum, keeping the physical insight of the Fano-Feshbach time independent formalisms. This method allows not only for accurate descriptions of the resonance parameters (energies, widths and Fano shape parameters) but also for the temporal evolution of the photodynamics involved in the resonant photoionization when using short laser pulses. We illustrate the performance of the method by analyzing the temporal formation of i) the one-photon ionization cross section below the second ionization threshold and the buildup of Fano profiles and ii) the up-down asymmetry of photoelectron angular distributions resulting from interferences of S-, P- and D-waves after simultaneous photoexcitation and decay of the lowest 1Se, 1Po and 1De resonant states, by using two sequential laser pulses with XUV harmonic frequencies separated by a time delay.application/pdfengInstitute of Physics Publishing (IOP)Grupo de Física Atómica y MolecularReino Unidoinfo:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_2df8fbb1https://purl.org/redcol/resource_type/ARTArtículo de investigaciónhttp://purl.org/coar/version/c_970fb48d4fbd8a85http://purl.org/coar/version/c_71e4c1898caa6e32Atribución-NoComercial-SinDerivadas 2.5 Colombiainfo:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-nd/2.5/co/http://purl.org/coar/access_right/c_abf2https://creativecommons.org/licenses/by-nc-nd/4.0/Método de FeshbachFotoionizaciónLásersLasersTime-dependent Feshbach method to study resonant photoionization of He with ultrashort laser pulsesJ. 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