The absolute optical oscillator strengths of the 3p54 s and $3{{\rm{p}}}^{5}4{{\rm{s}}}^{\prime }$ excitations of argon measured by the dipole (γ,γ) method

The optical oscillator strengths of the 3p54s and 3 p 5 4 s ′ ?> excitations of argon are of crucial importance in determining the elemental abundance of argon from astronomical observations. Substantial efforts have been made to determine the optical oscillator strengths of the 3p54s and 3 p 5 4 s ′ ?> transitions of argon, however, significant discrepancies among the reported values still exist. In this work, the absolute optical oscillator strengths of the 3p54s and 3 p 5 4 s ′ ?> transitions of argon have been measured by a newly developed high-resolution dipole (γ, γ) method. A comprehensive comparison with the previous experimental and theoretical data was then made as a cross-check.