Ar 2p excited states of argon in non-polar media

Abstract

Ar 2p photoabsorption spectra for Ar solid and Ar mixture with Kr, Xe and N 2 have been measured in order to study Ar 2p excited states in solid phase. Based on difference between partial electron yield and fluorescence yield spectra for solid Ar, Ar 2p 3/2–4s and 2p 3/2–4p excitations on surface are identified. For Ar:Kr and Ar:Xe mixtures, all bands move to lower energy as the Ar concentration decreases. Compared with solid Ar, Ar:N 2 mixtures show small red shift for the Ar 2p 3/2–4s excitation and blue shift for broad bands originating from Ar 2p– nd excitations. The spectral differences between the mixtures are discussed in terms of the polarization stabilization of the ionization threshold and the exchange repulsion of the Rydberg electron by the valence electrons of the neighboring atoms/molecules.