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Natural orbitals of helium in linearly polarized laser fields

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Abstract

Practicable equations of motion for the natural orbitals of a spin-singlet helium atom in a linearly polarized laser field are presented. The cylindrical symmetry of the two-electron problem with quantum number M = 0 is shown to yield a sparse expansion of natural orbitals in spherical harmonics. This optimization facilitates the propagation of renormalized natural orbitals of the helium atom. As a demonstration, the equations of motion are solved for a high-harmonic-generation process. In addition to the expected plateau from the single-active-electron picture, the spectrum of emitted radiation features a second plateau at higher harmonic orders.

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Authors and Affiliations

  1. Institut für Physik, Universität Rostock, 18051, Rostock, Germany

    Julius Rapp & Dieter Bauer

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  1. Julius Rapp
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  2. Dieter Bauer
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Correspondence to Dieter Bauer.

Additional information

Contribution to the Topical Issue “Special issue in honor of Hardy Gross”, edited by C.A. Ullrich, F.M.S. Nogueira, A. Rubio, and M.A.L. Marques.

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Rapp, J., Bauer, D. Natural orbitals of helium in linearly polarized laser fields. Eur. Phys. J. B 91, 151 (2018). https://doi.org/10.1140/epjb/e2018-90178-5

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