EMITTED ELECTRON-SPECTRA FROM DOUBLY-EXCITED STATES 1S(2)NLN'L' OF BE-LIKE IONS PRODUCED BY THE COLLISIONS OF O6-EARTH ATOMS( AND C4+ IONS WITH ALKALINE)

Electron spectra ejected from doubly excited states of Be-like ions pr oduced by two electron capture processes in O6+ + Ca, C4+ + Mg and C4 + Ca collisions have been measured by means of high resolution zero-d egree electron spectroscopy. For the O6+ + Ca collision, spectra from the 1s(2)4lnl' and 1s(2)5lnl' states are observed in addition to those from the 1s(2)3lnl' states in which n equals six or larger. For the C 4+ + Mg and Ca collisions, spectra from the 1s(2)3lnl' and 1s(2)4lnl' states are observed Population distributions of the states are explain ed as a whole using the concept of the reaction window based on the ex tended classical over-barrier model by Niehaus.