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Abstract:

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.

Registro:

Documento: Artículo
Título:Intra- and intercycle interference of angle-resolved electron emission in laser-assisted XUV atomic ionization
Autor:Gramajo, A.A.; Picca, R.D.; López, S.D.; Arbó, D.G.
Filiación:CONICET, Centro Atómico Bariloche (CNEA), Bariloche, 8400, Argentina
Institute of Astronomy and Space Physics IAFE (CONICET-UBA), CC 67, Suc. 28, Buenos Aires, C1428ZAA, Argentina
Palabras clave: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
Año:2018
Volumen:51
Número:5
DOI: http://dx.doi.org/10.1088/1361-6455/aaaa28
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_v51_n5_p_Gramajo

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Citas:

---------- APA ----------
Gramajo, A.A., Picca, R.D., López, S.D. & Arbó, D.G. (2018) . Intra- and intercycle interference of angle-resolved electron emission in laser-assisted XUV atomic ionization. Journal of Physics B: Atomic, Molecular and Optical Physics, 51(5).
http://dx.doi.org/10.1088/1361-6455/aaaa28
---------- CHICAGO ----------
Gramajo, A.A., Picca, R.D., López, S.D., Arbó, D.G. "Intra- and intercycle interference of angle-resolved electron emission in laser-assisted XUV atomic ionization" . Journal of Physics B: Atomic, Molecular and Optical Physics 51, no. 5 (2018).
http://dx.doi.org/10.1088/1361-6455/aaaa28
---------- MLA ----------
Gramajo, A.A., Picca, R.D., López, S.D., Arbó, D.G. "Intra- and intercycle interference of angle-resolved electron emission in laser-assisted XUV atomic ionization" . Journal of Physics B: Atomic, Molecular and Optical Physics, vol. 51, no. 5, 2018.
http://dx.doi.org/10.1088/1361-6455/aaaa28
---------- VANCOUVER ----------
Gramajo, A.A., Picca, R.D., López, S.D., Arbó, D.G. Intra- and intercycle interference of angle-resolved electron emission in laser-assisted XUV atomic ionization. J Phys B At Mol Opt Phys. 2018;51(5).
http://dx.doi.org/10.1088/1361-6455/aaaa28