SHAKE-OFF MECHANISM OF 2-ELECTRON TRANSITIONS IN SLOW ION-ATOM COLLISIONS

The shake-off mechanism, known in photon impact, has been applied to t he analysis of two-electron transitions in slow ion-atom collisions. T he mechanism consists of relaxation of the electronic state of an oute r target electron upon relocalization of the inner-electron wave funct ion from the target to projectile nucleus. Based on this mechanism, a method is proposed to estimate cross sections of two-electron processe s. The method is demonstrated by calculating cross sections of double capture, transfer excitation, and transfer ionization for collisions o f the excited He (1s2l) atom with the B5+ ion. The dependence of the c ross sections of double capture and transfer excitation on the princip al quantum number n of the final state is presented.