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.
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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.
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Xu, LQ., Liu, YW., Xu, X. et al. Optical oscillator strengths of the valence-shell excitations of atoms and molecules determined by the dipole (γ,γ) method. Eur. Phys. J. D 71, 183 (2017). https://doi.org/10.1140/epjd/e2017-70812-8
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DOI: https://doi.org/10.1140/epjd/e2017-70812-8