Valence photoelectron satellites of neon

Synchrotron radiation was directed at neon gas, creating Ne⁺ ions in ``satellite'' states characterized by the configurations 1s²2s²2p⁴nl, in addition to the main-line final states: 2s^-1 and 2p^-1. Satellite features appearing in the photoelectron spectrum were studied in the near-threshold region with photon energies from 55.2 to 99.7 eV. For three of the satellite peaks, the angular-distribution-asymmetry parameter βᵢ varies with kinetic energy in much the same way as the asymmetry parameter of the 2p line. None of the satellites have a βᵢ like that of the 2s line. All the satellite partial cross sections σᵢ have a kinetic-energy dependence similar to the partial cross section of the 2p main line. However, the σᵢ curves are not identical, and some deviation from the 2p intensity behavior is observed. These βᵢ and σᵢ results are used to confirm the previous assignments of the satellite final states in neon and to consider, in general, the energy-dependent behavior of satellites near threshold.