Intra- and intercycle interference of angle-resolved electron emission in laser-assisted XUV atomic ionization
A theoretical study of ionization of the hydrogen atom due to an XUV pulse in the presence of an infrared (IR) laser is presented. Well-established theories are usually used to describe the laser-assisted photoelectron effect: the well-known soft-photon approximation firstly posed by Maquet et al (2...
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2018
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09534075_v51_n5_p_Gramajo http://hdl.handle.net/20.500.12110/paper_09534075_v51_n5_p_Gramajo |
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paper:paper_09534075_v51_n5_p_Gramajo2023-06-08T15:55:22Z Intra- and intercycle interference of angle-resolved electron emission in laser-assisted XUV atomic ionization angle-resolved photoelectron spectra intra- and intercycle interferences laser-assited photoelectric effect semiclassical model XUV+IR multiphoton ionization Atom lasers Atoms Distortion (waves) Photoelectricity Photoelectron spectroscopy Photoelectrons Photoionization Photons Polarization Trajectories Angle-resolved photoelectron spectra Coarse-grained structure Continuum distorted waves intra- and intercycle interferences Intracycle interferences Multiphoton ionization Semiclassical model Strong-field approximations Electron emission A theoretical study of ionization of the hydrogen atom due to an XUV pulse in the presence of an infrared (IR) laser is presented. Well-established theories are usually used to describe the laser-assisted photoelectron effect: the well-known soft-photon approximation firstly posed by Maquet et al (2007 J. Mod. Opt. 54 1847) and Kazansky's theory in (2010 Phys. Rev. A 82, 033420). However, these theories completely fail to predict the electron emission perpendicularly to the polarization direction. Making use of a semiclassical model (SCM), we study the angle-resolved energy distribution of PEs for the case that both fields are linearly polarized in the same direction. We thoroughly analyze and characterize two different emission regions in the angle-energy domain: (i) the parallel-like region with contribution of two classical trajectories per optical cycle and (ii) the perpendicular-like region with contribution of four classical trajectories per optical cycle. We show that our SCM is able to assess the interference patterns of the angle-resolved PE spectrum in the two different mentioned regions. Electron trajectories stemming from different optical laser cycles give rise to angle-independent intercycle interferences known as sidebands. These sidebands are modulated by an angle-dependent coarse-grained structure coming from the intracycle interference of the electron trajectories born during the same optical cycle. We show the accuracy of our SCM as a function of the time delay between the IR and the XUV pulses and also as a function of the laser intensity by comparing the semiclassical predictions of the angle-resolved PE spectrum with the continuum-distorted wave strong field approximation and the ab initio solution of the time-dependent Schrödinger equation. © 2018 IOP Publishing Ltd. 2018 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09534075_v51_n5_p_Gramajo http://hdl.handle.net/20.500.12110/paper_09534075_v51_n5_p_Gramajo |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
angle-resolved photoelectron spectra intra- and intercycle interferences laser-assited photoelectric effect semiclassical model XUV+IR multiphoton ionization Atom lasers Atoms Distortion (waves) Photoelectricity Photoelectron spectroscopy Photoelectrons Photoionization Photons Polarization Trajectories Angle-resolved photoelectron spectra Coarse-grained structure Continuum distorted waves intra- and intercycle interferences Intracycle interferences Multiphoton ionization Semiclassical model Strong-field approximations Electron emission |
| spellingShingle |
angle-resolved photoelectron spectra intra- and intercycle interferences laser-assited photoelectric effect semiclassical model XUV+IR multiphoton ionization Atom lasers Atoms Distortion (waves) Photoelectricity Photoelectron spectroscopy Photoelectrons Photoionization Photons Polarization Trajectories Angle-resolved photoelectron spectra Coarse-grained structure Continuum distorted waves intra- and intercycle interferences Intracycle interferences Multiphoton ionization Semiclassical model Strong-field approximations Electron emission Intra- and intercycle interference of angle-resolved electron emission in laser-assisted XUV atomic ionization |
| topic_facet |
angle-resolved photoelectron spectra intra- and intercycle interferences laser-assited photoelectric effect semiclassical model XUV+IR multiphoton ionization Atom lasers Atoms Distortion (waves) Photoelectricity Photoelectron spectroscopy Photoelectrons Photoionization Photons Polarization Trajectories Angle-resolved photoelectron spectra Coarse-grained structure Continuum distorted waves intra- and intercycle interferences Intracycle interferences Multiphoton ionization Semiclassical model Strong-field approximations Electron emission |
| description |
A theoretical study of ionization of the hydrogen atom due to an XUV pulse in the presence of an infrared (IR) laser is presented. Well-established theories are usually used to describe the laser-assisted photoelectron effect: the well-known soft-photon approximation firstly posed by Maquet et al (2007 J. Mod. Opt. 54 1847) and Kazansky's theory in (2010 Phys. Rev. A 82, 033420). However, these theories completely fail to predict the electron emission perpendicularly to the polarization direction. Making use of a semiclassical model (SCM), we study the angle-resolved energy distribution of PEs for the case that both fields are linearly polarized in the same direction. We thoroughly analyze and characterize two different emission regions in the angle-energy domain: (i) the parallel-like region with contribution of two classical trajectories per optical cycle and (ii) the perpendicular-like region with contribution of four classical trajectories per optical cycle. We show that our SCM is able to assess the interference patterns of the angle-resolved PE spectrum in the two different mentioned regions. Electron trajectories stemming from different optical laser cycles give rise to angle-independent intercycle interferences known as sidebands. These sidebands are modulated by an angle-dependent coarse-grained structure coming from the intracycle interference of the electron trajectories born during the same optical cycle. We show the accuracy of our SCM as a function of the time delay between the IR and the XUV pulses and also as a function of the laser intensity by comparing the semiclassical predictions of the angle-resolved PE spectrum with the continuum-distorted wave strong field approximation and the ab initio solution of the time-dependent Schrödinger equation. © 2018 IOP Publishing Ltd. |
| title |
Intra- and intercycle interference of angle-resolved electron emission in laser-assisted XUV atomic ionization |
| title_short |
Intra- and intercycle interference of angle-resolved electron emission in laser-assisted XUV atomic ionization |
| title_full |
Intra- and intercycle interference of angle-resolved electron emission in laser-assisted XUV atomic ionization |
| title_fullStr |
Intra- and intercycle interference of angle-resolved electron emission in laser-assisted XUV atomic ionization |
| title_full_unstemmed |
Intra- and intercycle interference of angle-resolved electron emission in laser-assisted XUV atomic ionization |
| title_sort |
intra- and intercycle interference of angle-resolved electron emission in laser-assisted xuv atomic ionization |
| publishDate |
2018 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09534075_v51_n5_p_Gramajo http://hdl.handle.net/20.500.12110/paper_09534075_v51_n5_p_Gramajo |
| _version_ |
1768545565191176192 |