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Effect of electron correlation on the two-particle dynamics of a helium atom in a strong laser pulse

Dahlen, Nils-Erik LU (2002) In International Journal of Modern Physics B 16(3). p.415-452
Abstract
This review discusses the complicated two-electron dynamics of a helium atom in an intense, short laser pulse. A helium gas in femtosecond laser pulses at long wave lengths (lambda similar to 700 nm) and high intensities (I similar to 10(15) W/cm(2)) produces surprisingly high numbers of He2+ ions. These laser fields cause large and fast electron oscillations, which makes a solution of the time-dependent Schrodinger equation numerically demanding. The system can be studied using a one-dimensional model atom, which has many of the same properties as the He atom. Using the one-dimensional model, the importance of including electron correlation in a simplified description of the two-electron dynamics is demonstrated. It is shown that electron... (More)
This review discusses the complicated two-electron dynamics of a helium atom in an intense, short laser pulse. A helium gas in femtosecond laser pulses at long wave lengths (lambda similar to 700 nm) and high intensities (I similar to 10(15) W/cm(2)) produces surprisingly high numbers of He2+ ions. These laser fields cause large and fast electron oscillations, which makes a solution of the time-dependent Schrodinger equation numerically demanding. The system can be studied using a one-dimensional model atom, which has many of the same properties as the He atom. Using the one-dimensional model, the importance of including electron correlation in a simplified description of the two-electron dynamics is demonstrated. It is shown that electron correlation becomes much less important if the laser field has a short wave length, in which case the electron oscillations are smaller and slower. The problem of including electron correlation in the calculations is discussed in terms of approaches such as time-dependent Hartree-Fock, time-dependent density functional theory and time-dependent extended Hartree-Fock. Some of the commonly used semi-classical models for describing the double-ionization process are presented. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
International Journal of Modern Physics B
volume
16
issue
3
pages
415 - 452
publisher
World Scientific
external identifiers
  • wos:000174143500001
  • scopus:0037196656
ISSN
0217-9792
DOI
10.1142/S0217979202007987
language
English
LU publication?
yes
id
577f6b19-8af1-44bd-890d-3e8cf8ef2626 (old id 342578)
date added to LUP
2007-08-15 14:31:12
date last changed
2017-01-01 06:59:20
@article{577f6b19-8af1-44bd-890d-3e8cf8ef2626,
  abstract     = {This review discusses the complicated two-electron dynamics of a helium atom in an intense, short laser pulse. A helium gas in femtosecond laser pulses at long wave lengths (lambda similar to 700 nm) and high intensities (I similar to 10(15) W/cm(2)) produces surprisingly high numbers of He2+ ions. These laser fields cause large and fast electron oscillations, which makes a solution of the time-dependent Schrodinger equation numerically demanding. The system can be studied using a one-dimensional model atom, which has many of the same properties as the He atom. Using the one-dimensional model, the importance of including electron correlation in a simplified description of the two-electron dynamics is demonstrated. It is shown that electron correlation becomes much less important if the laser field has a short wave length, in which case the electron oscillations are smaller and slower. The problem of including electron correlation in the calculations is discussed in terms of approaches such as time-dependent Hartree-Fock, time-dependent density functional theory and time-dependent extended Hartree-Fock. Some of the commonly used semi-classical models for describing the double-ionization process are presented.},
  author       = {Dahlen, Nils-Erik},
  issn         = {0217-9792},
  language     = {eng},
  number       = {3},
  pages        = {415--452},
  publisher    = {World Scientific},
  series       = {International Journal of Modern Physics B},
  title        = {Effect of electron correlation on the two-particle dynamics of a helium atom in a strong laser pulse},
  url          = {http://dx.doi.org/10.1142/S0217979202007987},
  volume       = {16},
  year         = {2002},
}