Satellite transitions near He/sub /spl alpha// lines in a dense plasma heated by 120 fsec laser

Summary form only given, as follows. Experimental X-ray spectra near the resonance line of He/sub /spl alpha// of Mg XI with simultaneously high spectral (up to /spl lambda///spl Delta//spl lambda/=10000) and spatial (/spl Delta/x=10 mkm) resolution was obtained from a plasma, heated by laser with a pulse duration of 120 fsec and energy about 20 mJ (flux density on the target was more than 10/sup 16/ W/cm/sup 2/). We demonstrate the important role of inner-shell excitation mechanism for low confinement parameters and propose new excitation channels from highly populated excited states (Li-like and Be-like satellite levels). The collision excitation cross sections for these processes do not decrease with principal quantum number. These channels can be also subject to electron beam excitation. It was shown also the big role of transient effects for Rydberg-satellites due to a strong three-body recombination into high n-states in the cooling phase. Total spectra simulations are in rather close agreement with experimental results.