THRESHOLD PHOTOELECTRON-SPECTRUM OF THE ARGON-3S SATELLITES

Lately a variety of techniques have studied the electron correlation satellites with binding energies between the Ar 3s ionization potential (29.24 eV) and the lowest 2p-2 ionization potential (43.38 eV). One of these techniques, threshold photoelectron spectroscopy, with ≈90 meV electron resolution, revealed at least 25 Individual electronic states. All of these could contribute to any other satellite spectrum, and this observation helped explain some discrepancies between previous measurements. This technique has been applied here to the same region (30 eV ≤ Hv ≤ 45 eV) with higher resolution (<60 meV at the Ar 3s-1 peak). In this higher resolution spectrum at least 29 Individual electronic states are present. In some cases multiplet splitting Is observed. © 1990.