PROPERTIES OF NE8-ATOM COLLISIONS( (4,4) AND NE8+ (3,N) STATES POPULATED DURING ION)

We study doubly excited Ne8+ ions in the context of double electron ca pture during the Ne10+ + He collision. We focus on the strongly intera cting Ne8+ (4,4) and Ne8+ (3,n) series which are located in th Ne9+ (n = 3) threshold region. First, we study the properties of Rydberg stat es belonging to (3, n) multiplets and (4,4) symmetrical states, on the basis of the Feshbach approach and L(2) discretization method. Positi ons, widths and couplings are calculated for the isolated Ne8+ ion. Th en we analyse the post-collisional system Ne8+ + He2+ on the basis of the atomic parameters previously calculated and using the close-coupli ng approach. Emphasis will be put on the study of the transfer of Ne8 (4,4) states to Ne8+ (3,n) Rydberg series and the resulting stabiliza tion (radiative de-excitation) and autoionization processes.