Abstract

Starting from first principles, I derive a time-dependent diagrammatic many-body formalism that can be used for strong harmonic fields. My aim has been to treat many-electron effects in an atom interacting with an intense laser field. The formalism derived describes the atom in terms of a damped many-body Floquet state. The diagrammatic expansion is similar to the ordinary time-independent atomic many-body theory, but some important changes have been made: The energy denominators contain time-dependent self-energies and the exact ground-state shift; the intermediate levels are dressed atomic states, for which each harmonic of a given atomic state is counted as a separate level; and the ground-state energy shift is given by a time-dependent Brillouin–Wigner-type energy equation, which in general must be solved numerically. The formalism is not linked but contains no divergences in the adiabatic limit of the electron–electron interaction. For weak fields the formalism reduces to the ordinary linked expansion. For a two-level system all diagrams can be summed, and the result is equivalent to the usual continued-fraction solution. I also derive the exact diagrammatic solution for a single level interacting with a continuum.

© 1992 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Diagrammatic many-body theory for atoms in high-intensity laser fields. Part I

Lars Jönsson and Göran Wendin
J. Opt. Soc. Am. B 9(5) 627-645 (1992)

Many-electron dynamics of heavy atoms in intense laser fields: effects of screening and correlation

Göran Wendin, Lars Jönsson, and Anne L’Huillier
J. Opt. Soc. Am. B 4(5) 833-846 (1987)

Theory of multiphoton ionization of atoms by intense laser fields

Robin Shakeshaft
J. Opt. Soc. Am. B 4(5) 705-719 (1987)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (17)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (74)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription