Resonant satellite transitions in argon

Abstract
The production of specific Ar+ satellite states has been studied with synchrotron radiation at wavelengths between 300 and 350 Å with an effective energy resolution of 20 meV. The specific states studied were the (3P)4p(2P3/2), (1D)4p(2F7/2), and (1D)4p(2P1/2) states. The fluorescent radiation emitted from these excited ionic states was measured at 4766, 4611, and 4133 Å by the use of narrow band interference filters. The variation of the fluorescence intensity was measured as a function of wavelength. this provided a measure of the relative cross section for production of the satellite states. Each satellite state was found to the completely dominated by autoionization of the neutral doubly excited states (3s23p4)nl, n'l' found in this spectral region.