The effect of the Coulomb potential on subcycle interference of electron wave packets in atomic ionization by two-colour laser pulses
We analyse the effect of the long-range potential of the ionic core on the photoelectron emission in atomic ionization by a linearly polarized subcycle sculpted laser pulse of two-colour components, where one frequency doubles the other. The total ionization yield consists mostly of direct electrons...
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2014
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09534075_v47_n20_p_Arbo http://hdl.handle.net/20.500.12110/paper_09534075_v47_n20_p_Arbo |
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paper:paper_09534075_v47_n20_p_Arbo |
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paper:paper_09534075_v47_n20_p_Arbo2023-06-08T15:55:19Z The effect of the Coulomb potential on subcycle interference of electron wave packets in atomic ionization by two-colour laser pulses Coulomb potential intracycle diffraction subcycle interference two-colour laser Atoms Color Coulomb blockade Diffraction Electric fields Ionization Laser optics Laser pulses Photoionization Photons Trajectories Coherent superpositions Coulomb potential Interference structures Intracycle interferences Photo-electron emission Photon absorption process Strong-field approximations Sub-cycle Ionization potential We analyse the effect of the long-range potential of the ionic core on the photoelectron emission in atomic ionization by a linearly polarized subcycle sculpted laser pulse of two-colour components, where one frequency doubles the other. The total ionization yield consists mostly of direct electrons, which can be characterized by both intracycle and intercycle interferences. Using a semiclassical model based on the Simple Man's Model, we can derive an analytical expression for the intracycle interference due to the coherent superposition of different electron trajectories released in the same sculpted optical cycle. In turn, the intercycle interference is the consequence of the superposition of multiple trajectories released at different cycles and is accounted for by the energy conservation in the photon absorption process. We show that a semiclassical description in terms of a diffraction process at a time grating for two-colour laser pulses remains qualitatively unchanged beyond the strong field approximation. In particular, the Coulomb potential shifts the intracycle interference modulations towards the threshold, whereas the intercycle interference pattern remains invariant. The present study completes a recent work by Xie etal (2013 New J. Phys. 15 043050), where the influence of the Coulomb field on atomic ionization by sculpted two-colour laser fields is probed but in which path interferences are not considered. Furthermore, this article gives theoretical support to recent experiments with He and Ar where the sub-cycle interference structures originating from trajectories launched within a time interval of less than one femtosecond were observed (Xie X et al 2012 Phys. Rev. Lett. 108 193004). © 2014 IOP Publishing Ltd. 2014 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09534075_v47_n20_p_Arbo http://hdl.handle.net/20.500.12110/paper_09534075_v47_n20_p_Arbo |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Coulomb potential intracycle diffraction subcycle interference two-colour laser Atoms Color Coulomb blockade Diffraction Electric fields Ionization Laser optics Laser pulses Photoionization Photons Trajectories Coherent superpositions Coulomb potential Interference structures Intracycle interferences Photo-electron emission Photon absorption process Strong-field approximations Sub-cycle Ionization potential |
| spellingShingle |
Coulomb potential intracycle diffraction subcycle interference two-colour laser Atoms Color Coulomb blockade Diffraction Electric fields Ionization Laser optics Laser pulses Photoionization Photons Trajectories Coherent superpositions Coulomb potential Interference structures Intracycle interferences Photo-electron emission Photon absorption process Strong-field approximations Sub-cycle Ionization potential The effect of the Coulomb potential on subcycle interference of electron wave packets in atomic ionization by two-colour laser pulses |
| topic_facet |
Coulomb potential intracycle diffraction subcycle interference two-colour laser Atoms Color Coulomb blockade Diffraction Electric fields Ionization Laser optics Laser pulses Photoionization Photons Trajectories Coherent superpositions Coulomb potential Interference structures Intracycle interferences Photo-electron emission Photon absorption process Strong-field approximations Sub-cycle Ionization potential |
| description |
We analyse the effect of the long-range potential of the ionic core on the photoelectron emission in atomic ionization by a linearly polarized subcycle sculpted laser pulse of two-colour components, where one frequency doubles the other. The total ionization yield consists mostly of direct electrons, which can be characterized by both intracycle and intercycle interferences. Using a semiclassical model based on the Simple Man's Model, we can derive an analytical expression for the intracycle interference due to the coherent superposition of different electron trajectories released in the same sculpted optical cycle. In turn, the intercycle interference is the consequence of the superposition of multiple trajectories released at different cycles and is accounted for by the energy conservation in the photon absorption process. We show that a semiclassical description in terms of a diffraction process at a time grating for two-colour laser pulses remains qualitatively unchanged beyond the strong field approximation. In particular, the Coulomb potential shifts the intracycle interference modulations towards the threshold, whereas the intercycle interference pattern remains invariant. The present study completes a recent work by Xie etal (2013 New J. Phys. 15 043050), where the influence of the Coulomb field on atomic ionization by sculpted two-colour laser fields is probed but in which path interferences are not considered. Furthermore, this article gives theoretical support to recent experiments with He and Ar where the sub-cycle interference structures originating from trajectories launched within a time interval of less than one femtosecond were observed (Xie X et al 2012 Phys. Rev. Lett. 108 193004). © 2014 IOP Publishing Ltd. |
| title |
The effect of the Coulomb potential on subcycle interference of electron wave packets in atomic ionization by two-colour laser pulses |
| title_short |
The effect of the Coulomb potential on subcycle interference of electron wave packets in atomic ionization by two-colour laser pulses |
| title_full |
The effect of the Coulomb potential on subcycle interference of electron wave packets in atomic ionization by two-colour laser pulses |
| title_fullStr |
The effect of the Coulomb potential on subcycle interference of electron wave packets in atomic ionization by two-colour laser pulses |
| title_full_unstemmed |
The effect of the Coulomb potential on subcycle interference of electron wave packets in atomic ionization by two-colour laser pulses |
| title_sort |
effect of the coulomb potential on subcycle interference of electron wave packets in atomic ionization by two-colour laser pulses |
| publishDate |
2014 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09534075_v47_n20_p_Arbo http://hdl.handle.net/20.500.12110/paper_09534075_v47_n20_p_Arbo |
| _version_ |
1768543712013451264 |