Abstract
The 3s,3p satellite spectrum of argon has been studied with use of synchrotron radiation in the 40--70-eV energy range. In the region of the 3s Cooper minimum (42.5 eV\ifmmode\pm\else\textpm\fi{}0.2), the integral intensity of the satellites is ten times larger than the 3s partial cross section. The angular asymmetry parameters have been measured as a function of the photoelectron energy for the 3s ${}^{2}$S,3p ${}^{2}$P final states as well as for the satellites. For the lowest photon energies it appears that the \ensuremath{\beta} parameter values of the most intense satellites are strongly dependent on the total angular momentum of the final ionic state.
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