Cover Image

Effects of ultrashort laser pulses on angular distributions of photoionization spectra

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 t...

Full description

Saved in:
Bibliographic Details
Main Authors: Raymond Ooi, C.H., Ho, W.L., Bandrauk, A.D.
Format: Article
Language:English
Published: Nature Publishing Group 2017
Subjects:
Q Science (General)
QC Physics
Online Access:http://eprints.um.edu.my/18992/1/Effects_of_ultrashort_laser_pulses_on_angular_distributions_of_photoionization_spectra.pdf
http://eprints.um.edu.my/18992/
http://dx.doi.org/10.1038/s41598-017-05915-8
Tags: Add Tag
No Tags, Be the first to tag this record!
id my.um.eprints.18992
record_format eprints
spelling my.um.eprints.189922018-08-08T04:04:28Z http://eprints.um.edu.my/18992/ Effects of ultrashort laser pulses on angular distributions of photoionization spectra Raymond Ooi, C.H. Ho, W.L. Bandrauk, A.D. Q Science (General) QC Physics 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 2Latin small letter h with strokeω 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 pulseï¿sï¿ 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. Nature Publishing Group 2017 Article PeerReviewed application/pdf en http://eprints.um.edu.my/18992/1/Effects_of_ultrashort_laser_pulses_on_angular_distributions_of_photoionization_spectra.pdf Raymond Ooi, C.H. and Ho, W.L. and Bandrauk, A.D. (2017) Effects of ultrashort laser pulses on angular distributions of photoionization spectra. Scientific Reports, 7 (1). p. 6739. ISSN 2045-2322 http://dx.doi.org/10.1038/s41598-017-05915-8 doi:10.1186/s11671-016-1793-y
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Research Repository
url_provider http://eprints.um.edu.my/
language English
topic Q Science (General)
QC Physics
spellingShingle Q Science (General)
QC Physics
Raymond Ooi, C.H.
Ho, W.L.
Bandrauk, A.D.
Effects of ultrashort laser pulses on angular distributions of photoionization spectra
description 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 2Latin small letter h with strokeω 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 pulseï¿sï¿ 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 Raymond Ooi, C.H.
Ho, W.L.
Bandrauk, A.D.
author_facet Raymond Ooi, C.H.
Ho, W.L.
Bandrauk, A.D.
author_sort Raymond Ooi, C.H.
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 Publishing Group
publishDate 2017
url http://eprints.um.edu.my/18992/1/Effects_of_ultrashort_laser_pulses_on_angular_distributions_of_photoionization_spectra.pdf
http://eprints.um.edu.my/18992/
http://dx.doi.org/10.1038/s41598-017-05915-8
_version_ 1643690854372605952
score 13.211869

Similar Items