Vibrational effects in the shape resonant photoionization leading to the A2T1u state of SF6+

•Vibrational effects on photoionization from the 5t1u5t1u subshell of SF6 are studied.•Averaging over the symmetric vibration led to 5% reduction of the cross section.•Averaging over the asymmetric vibration caused 45% reduction of the cross section.•The ν2(eg)ν2(eg) vibrations reduce the impact of the eg resonance on the cross sections.

The Chase’s adiabatic approximation and Schwinger variational technique in static-exchange approximation are applied to investigate the effect of vibrational averaging on the shape resonant photoionization leading to the A2T1u   state of SF6+. For this study, two of the S–F stretching vibrations are considered: the ν1ν1 symmetric stretching mode and the two degenerate ν2ν2 asymmetric stretching modes. Present work concludes that averaging over the asymmetric stretching mode of vibration reduces the peak eg resonant cross section by 45% relative to the results obtained at the equilibrium nuclear configuration, which agrees with experimental observation. However, the eg   shape resonance is not affected significantly by averaging over the ν1ν1 symmetric stretching mode of vibration.

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