Nonperturbative time-dependent theory of helium in a strong laser field
- 1 December 1991
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 44 (11) , R6994-R6997
- https://doi.org/10.1103/physreva.44.r6994
Abstract
We present a nonperturbative theory of the behavior of He in a strong pulsed laser. We address the question of the validity of frozen-core or single-active-electron approximations by providing direct quantitative comparisons with calculations including the complete two-electron behavior with correlation. Our results are illustrated with examples of nonlinear susceptibilities and ionization.Keywords
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