Phys. Rev. A 44, R6994–R6997 (1991)Nonperturbative time-dependent theory of helium in a strong laser field
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. © 1991 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.44.R6994
DOI:
10.1103/PhysRevA.44.R6994
PACS:
32.80.Rm, 32.80.Fb
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