Natural orbitals of helium in linearly polarized laser fields

Julius Rapp and Dieter Bauer ()
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Julius Rapp: Institut für Physik, Universität Rostock
Dieter Bauer: Institut für Physik, Universität Rostock

The European Physical Journal B: Condensed Matter and Complex Systems, 2018, vol. 91, issue 7, 1-11

Abstract: 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.

Date: 2018
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DOI: 10.1140/epjb/e2018-90178-5

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