Time-dependent wave-packet treatment of the Si4++He collision - art. no. 042704

The collisional system Si4+ + He has been studied over a range of mean rela tive ion kinetic energy going from 10(-2) to 10(2) eV/amu. In the low-energ y range, a time-dependent wave-packet approach is used both in the diabetic and the adiabatic representation using two different propagator techniques . The agreement between the two sets of results assess the accuracy of the present numerical approach. Above 2.5 eV/amu., a semiclassical eikonal calc ulation is performed, which includes the Coriolis couplings. Finally, the r ate constant is calculated and compared with the other theoretical data as well as with the experimental value of [Fang and Kwong, Phys. Rev. A 59, 34 2 (1999)]. The present results confirm the order of magnitude of previous t heoretical values.