Artículo
Abstract:
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.
Registro:
| Documento: | Artículo |
| Título: | The effect of the Coulomb potential on subcycle interference of electron wave packets in atomic ionization by two-colour laser pulses |
| Autor: | Arbó, D.G. |
| Filiación: | Institute for Astronomy and Space Physics, IAFE (CONICET-UBA), CC 67, Suc. 28, Buenos Aires, 1428, Argentina |
| Palabras clave: | 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 |
| Año: | 2014 |
| Volumen: | 47 |
| Número: | 20 |
| DOI: | http://dx.doi.org/10.1088/0953-4075/47/20/204008 |
| Título revista: | Journal of Physics B: Atomic, Molecular and Optical Physics |
| Título revista abreviado: | J Phys B At Mol Opt Phys |
| ISSN: | 09534075 |
| CODEN: | JPAPE |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09534075_v47_n20_p_Arbo |
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Citas:
---------- APA ----------
(2014) . The effect of the Coulomb potential on subcycle interference of electron wave packets in atomic ionization by two-colour laser pulses. Journal of Physics B: Atomic, Molecular and Optical Physics, 47(20).http://dx.doi.org/10.1088/0953-4075/47/20/204008
---------- CHICAGO ----------
Arbó, D.G. "The effect of the Coulomb potential on subcycle interference of electron wave packets in atomic ionization by two-colour laser pulses" . Journal of Physics B: Atomic, Molecular and Optical Physics 47, no. 20 (2014).http://dx.doi.org/10.1088/0953-4075/47/20/204008
---------- MLA ----------
Arbó, D.G. "The effect of the Coulomb potential on subcycle interference of electron wave packets in atomic ionization by two-colour laser pulses" . Journal of Physics B: Atomic, Molecular and Optical Physics, vol. 47, no. 20, 2014.http://dx.doi.org/10.1088/0953-4075/47/20/204008
---------- VANCOUVER ----------
Arbó, D.G. The effect of the Coulomb potential on subcycle interference of electron wave packets in atomic ionization by two-colour laser pulses. J Phys B At Mol Opt Phys. 2014;47(20).http://dx.doi.org/10.1088/0953-4075/47/20/204008
