Dynamic linear response of atoms in plasmas and photo-absorption cross-section in the dipole approximation

C. Caizergues 1, 2 T. Blenski 1, 2 R. Piron 3
2 MHDE - Matière à Haute Densité d'Energie
IRAMIS - Institut Rayonnement Matière de Saclay, LIDyl - Laboratoire Interactions, Dynamique et Lasers (ex SPAM)
Abstract : We report results on the self-consistent linear response theory of quantum average-atoms in plasmas. The approach is based on the two first orders of the cluster expansion of the plasma susceptibility. A change of variable is applied, which allows us to handle the diverging free-free transitions contribution in the self-consistent induced electron density and potential. The method is first tested on the case of rare gas isolated neutral atoms. A test of the Ehrenfest-type sum rule is then performed in a case of an actual average-atom in a plasma. At frequencies much higher than the plasma frequency, the sum rule seems to be fulfilled within the accuracy of the numerical methods. Close to the plasma frequency, the method seems not to account for the cold-plasma dielectric function renormalization in the sum rule, which was correctly reproduced in the case of the Thomas–Fermi–Bloch self-consistent linear response. This suggests the need for a better accounting for the outgoing waves in the asymptotic boundary conditions.
Document type :
Journal articles
Complete list of metadatas

https://hal-cea.archives-ouvertes.fr/cea-01334663
Contributor : Caroline Lebe <>
Submitted on : Tuesday, June 21, 2016 - 10:35:26 AM
Last modification on : Thursday, February 7, 2019 - 4:22:44 PM

Identifiers

Citation

C. Caizergues, T. Blenski, R. Piron. Dynamic linear response of atoms in plasmas and photo-absorption cross-section in the dipole approximation . High Energy Density Physics, Elsevier, 2016, 18, pp.7-13. ⟨10.1016/j.hedp.2015.11.001⟩. ⟨cea-01334663⟩

Share

Metrics

Record views

103