Rydberg series converging to the C̃ state of C 6F 6+ in threshold photoelectron and VUV absorption spectra of hexafluorobenzene

Abstract

A series of peaks in the threshold photoelectron spectrum (TPES) of hexafluorobenzene in the 13 eV region are found to have the same energies as Rydberg bands in the VUV absorption spectrum. The TPES and VUV absorption features are interpreted as an nd Rydberg series with a quantum defect δ = −0.02, converging to the C̃ electronic state of C 6F 6 + at 13.88 eV. The ion C̃ state is shown to have 2B 2u electronic symmetry.