https://doi.org/10.1140/epjd/e2017-70812-8
Regular Article
Optical oscillator strengths of the valence-shell excitations of atoms and molecules determined by the dipole (γ,γ) method*
1 Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, P.R. China
2 Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, P.R. China
3 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, P.R. China
a
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Received: 26 December 2016
Published online: 6 July 2017
Abstract
The dipole (γ,γ) method, which is the inelastic X-ray scattering operated at a negligibly small momentum transfer, has been developed to determine the absolute optical oscillator strengths of the valence-shell excitations of atoms and molecules. This new method is free from the line saturation effect, and its Bethe-Born conversion factor varies much more slowly with the excitation energy than that of the dipole (e, e) method. Thus the dipole (γ,γ) method provides a reliable approach to obtain the benchmark optical oscillator strengths of the valence-shell excitations for gaseous atoms and molecules. In this paper, we give a review of the dipole (γ,γ) method and some recent measurements of absolute optical oscillator strengths of gaseous atoms and molecules.
Contribution to the Topical Issue “Atomic and Molecular Data and their Applications”, edited by Gordon W.F. Drake, Jung-Sik Yoon, Daiji Kato, Grzegorz Karwasz.
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2017
