Diffraction at a time grating in above-threshold ionization: The influence of the Coulomb potential
We analyze the photoelectron emission spectrum in atomic above-threshold ionization by a linearly polarized short-laser pulse. Direct electrons can be characterized by both intracycle and intercycle interferences. The former results from the coherent superposition of two different electron trajector...
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2010
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10502947_v82_n4_p_Arbo http://hdl.handle.net/20.500.12110/paper_10502947_v82_n4_p_Arbo |
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paper:paper_10502947_v82_n4_p_Arbo2023-06-08T16:02:37Z Diffraction at a time grating in above-threshold ionization: The influence of the Coulomb potential Arbó, Diego Gabriel Above-threshold ionization Analytical expressions Coherent superpositions Coulomb potential Diffraction process Dinger equation Electron trajectories Femtoseconds Interference patterns Interference structures Linearly polarized Multi-cycle pulse Optical cycles Photo-electron emission Resolution spectra Semiclassical model Short laser pulse Sub-cycle Three-dimensional (3D) Time interval Time-dependent Atomic spectroscopy Coulomb blockade Diffraction Electric fields Emission spectroscopy Ionization potential Photoelectron spectroscopy Photoionization Trajectories Three dimensional We analyze the photoelectron emission spectrum in atomic above-threshold ionization by a linearly polarized short-laser pulse. Direct electrons can be characterized by both intracycle and intercycle interferences. The former results from the coherent superposition of two different electron trajectories released in the same optical cycle, whereas the latter is the consequence of the superposition of multiple trajectories released in different cycles. In the present article, a semiclassical analytical expression for the complete (both intracycle and intercycle) interference pattern is derived. We show that the recently proposed semiclassical description in terms of a diffraction process at a time grating remains qualitatively unchanged in the presence of the long-range Coulomb potential. The latter causes only a phase shift of the intracycle interference pattern. We verify the predictions of the semiclassical model by comparison with full three-dimensional (3D) time-dependent Schrödinger equation (TDSE) solutions. One key finding is that the subcycle interference structures originating from trajectories launched within a time interval of less than 1 femtosecond should be experimentally observable also in low-resolution spectra for longer multicycle pulses. © 2010 The American Physical Society. Fil:Arbó, D.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2010 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10502947_v82_n4_p_Arbo http://hdl.handle.net/20.500.12110/paper_10502947_v82_n4_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 |
Above-threshold ionization Analytical expressions Coherent superpositions Coulomb potential Diffraction process Dinger equation Electron trajectories Femtoseconds Interference patterns Interference structures Linearly polarized Multi-cycle pulse Optical cycles Photo-electron emission Resolution spectra Semiclassical model Short laser pulse Sub-cycle Three-dimensional (3D) Time interval Time-dependent Atomic spectroscopy Coulomb blockade Diffraction Electric fields Emission spectroscopy Ionization potential Photoelectron spectroscopy Photoionization Trajectories Three dimensional |
| spellingShingle |
Above-threshold ionization Analytical expressions Coherent superpositions Coulomb potential Diffraction process Dinger equation Electron trajectories Femtoseconds Interference patterns Interference structures Linearly polarized Multi-cycle pulse Optical cycles Photo-electron emission Resolution spectra Semiclassical model Short laser pulse Sub-cycle Three-dimensional (3D) Time interval Time-dependent Atomic spectroscopy Coulomb blockade Diffraction Electric fields Emission spectroscopy Ionization potential Photoelectron spectroscopy Photoionization Trajectories Three dimensional Arbó, Diego Gabriel Diffraction at a time grating in above-threshold ionization: The influence of the Coulomb potential |
| topic_facet |
Above-threshold ionization Analytical expressions Coherent superpositions Coulomb potential Diffraction process Dinger equation Electron trajectories Femtoseconds Interference patterns Interference structures Linearly polarized Multi-cycle pulse Optical cycles Photo-electron emission Resolution spectra Semiclassical model Short laser pulse Sub-cycle Three-dimensional (3D) Time interval Time-dependent Atomic spectroscopy Coulomb blockade Diffraction Electric fields Emission spectroscopy Ionization potential Photoelectron spectroscopy Photoionization Trajectories Three dimensional |
| description |
We analyze the photoelectron emission spectrum in atomic above-threshold ionization by a linearly polarized short-laser pulse. Direct electrons can be characterized by both intracycle and intercycle interferences. The former results from the coherent superposition of two different electron trajectories released in the same optical cycle, whereas the latter is the consequence of the superposition of multiple trajectories released in different cycles. In the present article, a semiclassical analytical expression for the complete (both intracycle and intercycle) interference pattern is derived. We show that the recently proposed semiclassical description in terms of a diffraction process at a time grating remains qualitatively unchanged in the presence of the long-range Coulomb potential. The latter causes only a phase shift of the intracycle interference pattern. We verify the predictions of the semiclassical model by comparison with full three-dimensional (3D) time-dependent Schrödinger equation (TDSE) solutions. One key finding is that the subcycle interference structures originating from trajectories launched within a time interval of less than 1 femtosecond should be experimentally observable also in low-resolution spectra for longer multicycle pulses. © 2010 The American Physical Society. |
| author |
Arbó, Diego Gabriel |
| author_facet |
Arbó, Diego Gabriel |
| author_sort |
Arbó, Diego Gabriel |
| title |
Diffraction at a time grating in above-threshold ionization: The influence of the Coulomb potential |
| title_short |
Diffraction at a time grating in above-threshold ionization: The influence of the Coulomb potential |
| title_full |
Diffraction at a time grating in above-threshold ionization: The influence of the Coulomb potential |
| title_fullStr |
Diffraction at a time grating in above-threshold ionization: The influence of the Coulomb potential |
| title_full_unstemmed |
Diffraction at a time grating in above-threshold ionization: The influence of the Coulomb potential |
| title_sort |
diffraction at a time grating in above-threshold ionization: the influence of the coulomb potential |
| publishDate |
2010 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10502947_v82_n4_p_Arbo http://hdl.handle.net/20.500.12110/paper_10502947_v82_n4_p_Arbo |
| work_keys_str_mv |
AT arbodiegogabriel diffractionatatimegratinginabovethresholdionizationtheinfluenceofthecoulombpotential |
| _version_ |
1768545748453949440 |