Speaker
Description
Transfer ionization (TI) is one of the processes that in the past 20 years allowed elucidating the role of target electron correlation in ion-atom collisions. A decade ago, fully differential cross sections which depend on the emitted electron momentum distribution were measured for H++He collisions at impact energies of 300 and 630 keV. This study allowed determining the dominant role of the initial state correlation over the dynamical correlation experienced by the electron in the reaction region or in the final state [1].
In this work, we explore the dynamics of TI in collisions of H+, He2+ and Li3+ ions with He atoms in the ground state. The impact energy range considered is 10 keV/u-1 MeV/u. Three different variants of the 4-body classical trajectory Monte Carlo (CTMC) method are employed: i) the nCTMC, in which the electrons are considered as independent particles initialized with sequential binding energies of 0.903 a.u. and 2.0 a.u. [2], ii) the Heisenberg core (HC-CTMC), which in-cludes the e-e correlation via the introduction of momentum-dependent stabilizing potentials [3] and iii) the energy-bounded (EB-CTMC) [4], which also includes the full e-e correlation.
We found that according to our correlated model, TI events take mainly place while the projectile is still approaching the target. Moreover, electron capture seems to proceed first with a time dif-ference between peak positions of about 0.5 a.u. of time. Results obtained with the three classical models are analyzed as a function of the impact energy.
The work was supported by the Bilateral relationships between Argentina and Hungary in science and technology (S&T) under project number 2019-2.1.11-TÉT-2020-00202. Work at IFISUR was supported by Grant No. PGI 24/F084, Secretaría General de Ciencia y Tecnología, Universidad Nacional del Sur.
References
[1] Schöffler M. S. et al 2013 Phys. Rev. A 88 042710
[2] Olson R. E. 1987 J. Phys. B: At. Mol. Opt. Phys. 20 L809
[3] Zajfman D. and Maor D. 1986 Phys. Rev. Lett. 56 320
[4] Cohen J. S. 1996 Phys. Rev. A 54 573
