Atomic photoionization cross-sections beyond the electric dipole approximation

Autor:	Brumboiu, Iulia Emilia, Eriksson, Olle, Norman, Patrick
Rok vydání:	2018
Předmět:	Physics - Atomic Physics Condensed Matter - Materials Science
Druh dokumentu:	Working Paper
DOI:	10.1063/1.5083649
Popis:	A methodology is developed to compute photoionization cross-sections beyond the electric dipole (BED) approximation from response theory, using Gaussian type orbitals and plane waves for the initial and final states, respectively. The methodology is applied to compute photoionization cross-sections of atoms and ions from the first four rows of the Periodic Table. Analysing the error due to the plane wave description of the photoelectron, we find kinetic energy and concomitant photon energy thresholds above which the plane wave approximation becomes applicable. The correction introduced by going beyond the electric dipole approximation increases with photon energy and depends on the spatial extension of the initial state. In general, the corrections are below 10% for most elements, at a photon energy reaching up to 12 keV. Comment: 29 pages, 7 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1810.08542 Zobrazit plný text záznamu View this record from Arxiv