Effects of ultrashort laser pulses on angular distributions of photoionization spectra

Abstract We study the photoelectron spectra by intense laser pulses with arbitrary time dependence and phase within the Keldysh framework. An efficient semianalytical approach using analytical transition matrix elements for hydrogenic atoms in any initial state enables efficient and accurate computa...

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Autores principales:	C. H. Raymond Ooi, W. L. Ho, A. D. Bandrauk
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/f7f6fb9fa99445b79ee399d322105195
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spelling	oai:doaj.org-article:f7f6fb9fa99445b79ee399d3221051952021-12-02T11:52:34ZEffects of ultrashort laser pulses on angular distributions of photoionization spectra10.1038/s41598-017-05915-82045-2322https://doaj.org/article/f7f6fb9fa99445b79ee399d3221051952017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-05915-8https://doaj.org/toc/2045-2322Abstract We study the photoelectron spectra by intense laser pulses with arbitrary time dependence and phase within the Keldysh framework. An efficient semianalytical approach using analytical transition matrix elements for hydrogenic atoms in any initial state enables efficient and accurate computation of the photoionization probability at any observation point without saddle point approximation, providing comprehensive three dimensional photoelectron angular distribution for linear and elliptical polarizations, that reveal the intricate features and provide insights on the photoionization characteristics such as angular dispersions, shift and splitting of photoelectron peaks from the tunneling or above threshold ionization(ATI) regime to non-adiabatic(intermediate) and multiphoton ionization(MPI) regimes. This facilitates the study of the effects of various laser pulse parameters on the photoelectron spectra and their angular distributions. The photoelectron peaks occur at multiples of 2ħω for linear polarization while odd-ordered peaks are suppressed in the direction perpendicular to the electric field. Short pulses create splitting and angular dispersion where the peaks are strongly correlated to the angles. For MPI and elliptical polarization with shorter pulses the peaks split into doublets and the first peak vanishes. The carrier envelope phase(CEP) significantly affects the ATI spectra while the Stark effect shifts the spectra of intermediate regime to higher energies due to interference.C. H. Raymond OoiW. L. HoA. D. BandraukNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-22 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q C. H. Raymond Ooi W. L. Ho A. D. Bandrauk Effects of ultrashort laser pulses on angular distributions of photoionization spectra
description	Abstract We study the photoelectron spectra by intense laser pulses with arbitrary time dependence and phase within the Keldysh framework. An efficient semianalytical approach using analytical transition matrix elements for hydrogenic atoms in any initial state enables efficient and accurate computation of the photoionization probability at any observation point without saddle point approximation, providing comprehensive three dimensional photoelectron angular distribution for linear and elliptical polarizations, that reveal the intricate features and provide insights on the photoionization characteristics such as angular dispersions, shift and splitting of photoelectron peaks from the tunneling or above threshold ionization(ATI) regime to non-adiabatic(intermediate) and multiphoton ionization(MPI) regimes. This facilitates the study of the effects of various laser pulse parameters on the photoelectron spectra and their angular distributions. The photoelectron peaks occur at multiples of 2ħω for linear polarization while odd-ordered peaks are suppressed in the direction perpendicular to the electric field. Short pulses create splitting and angular dispersion where the peaks are strongly correlated to the angles. For MPI and elliptical polarization with shorter pulses the peaks split into doublets and the first peak vanishes. The carrier envelope phase(CEP) significantly affects the ATI spectra while the Stark effect shifts the spectra of intermediate regime to higher energies due to interference.
format	article
author	C. H. Raymond Ooi W. L. Ho A. D. Bandrauk
author_facet	C. H. Raymond Ooi W. L. Ho A. D. Bandrauk
author_sort	C. H. Raymond Ooi
title	Effects of ultrashort laser pulses on angular distributions of photoionization spectra
title_short	Effects of ultrashort laser pulses on angular distributions of photoionization spectra
title_full	Effects of ultrashort laser pulses on angular distributions of photoionization spectra
title_fullStr	Effects of ultrashort laser pulses on angular distributions of photoionization spectra
title_full_unstemmed	Effects of ultrashort laser pulses on angular distributions of photoionization spectra
title_sort	effects of ultrashort laser pulses on angular distributions of photoionization spectra
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/f7f6fb9fa99445b79ee399d322105195
work_keys_str_mv	AT chraymondooi effectsofultrashortlaserpulsesonangulardistributionsofphotoionizationspectra AT wlho effectsofultrashortlaserpulsesonangulardistributionsofphotoionizationspectra AT adbandrauk effectsofultrashortlaserpulsesonangulardistributionsofphotoionizationspectra
_version_	1718395022645133312

Effects of ultrashort laser pulses on angular distributions of photoionization spectra

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