Single and double electron capture

SINGLE AND DOUBLE ELECTRON CAPTURE IN BORON COLLISION SYSTEMS... 

Single and double electron capture in boron collision systems 133... 

The potential energy curves of the E, TI and one states involved in the single- and double-electron capture processes are displayed in Fig. 1. The n and A potential energy curves show no evidence of avoided crossings, but three avoided crossings appear in the range [6.0-9.0 a.u.] between the entry channel and the -t- He ) states of... 

TABLE 2. Comparison of asymptotic energy values with experimental [13] (single-electron capture levels) and theoretical data [17] (double-electron capture levels) (ina.u)... 

In accordance with previous investigations [8,9], Aese experiments have shown a quite different behaviour for N (ls )than for other multicharged ions such as the isoelectronic ion [10. The single-electron capture process has been shown to be dominant on the n = 3 levels and in particular on the 3s level for collision energies lower than 50 keV. A high probability of double capture has also been observed characterized by an intense peak at X = 76.5 nm attributed to the 2s > 2s 2p P transition [4,5,7]. Furthermore,... 

A complete theoretical treatment of the + He collision should therefore take into account, first the single-electron capture process from the ground state entry channel N (ls ) S -I- He(ls ) S and also from the metastable level NP (ls2s)-1- He(ls ) in order to take eare of the fraction of metastable N ion in the incident beam, as well as the double-eleetron capture process from both ground and metastable ions. 

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