Hannover 2016 – scientific programme
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A: Fachverband Atomphysik
A 40: Precision spectroscopy of atoms and ions III (with Q)
A 40.2: Talk
Friday, March 4, 2016, 11:15–11:30, f428
Identification of the splitting and sequence of closely-spaced energy levels by analyzing the angle-resolved fluorescence light — •Zhongwen Wu1,2, Andrey Surzhykov1, Andrey Volotka1, and Stephan Fritzsche1,3 — 1Helmholtz Institute Jena, Germany — 2Northwest Normal University, China — 3University of Jena, Germany
The energy-dependent photoexcitation and subsequent fluorescence radiation of atoms have been investigated within the framework of second-order perturbation theory and the density matrix theory. Special attention has been paid to the angular distribution of the characteristic x-rays from (partial) overlapping resonances and how they are affected by the level splitting and the sequence of these resonances, if analyzed as a function of the photon energy of the exciting light. Detailed computations within the multiconfiguration Dirac-Fock method were carried out for the 1s22s22p63s J0=1/2 + γ1(ℏω) → (1s22s2p63s)13p3/2 J=1/2, 3/2 → 1s22s22p63s Jf=1/2 + γ2 excitation and decay of neutral sodium atoms. A remarkably strong dependence of the angular distribution of these x-rays upon the level splitting and even the sequence was found by crossing the resonances. This dependence arises from the finite lifetime of the overlapping resonances. We therefore suggest that accurate measurements of x-ray angular distribution could be used to identify the level splitting and sequence of closely-spaced atomic resonances following inner-shell excitations.