Correlation satellites in the outer-shell photoelectron spectrum of argon

Abstract

The authors present satellite photoelectron spectra from the outer shell of argon whose binding energies range from 32 to 43 eV, using synchrotron radiation in the 40-80 eV photon energy region. It has been possible to obtain satellite spectra much better resolved than those previously obtained by Spears et al. (1974) as well as to observe new satellite lines appearing only at low photon energy. An assignment is proposed for all the satellites observed by the authors. These experimental results show that the 3s3p^{6 2}S to 3s²3p⁴ns, nd ²S transfer has been fairly well accounted for by the theoreticians, but they also show clearly that the satellite spectra following photoionisation in the outer shell of argon arise from both the 3s and 3p subshells and that the final-ionic-state configuration-interaction mechanism describes only part of the spectrum.