Time-dependent spin-density-functional-theory description of ${\mathrm{He}}^{+}$-He collisions

Theoretical total cross-section results for all ionization and capture processes in the ${\mathrm{He}}^{+}$-He collision system are presented in the approximate impact energy range of 10–1000 keV/amu. Calculations were performed within the framework of time-dependent spin-density functional theory. The Krieger-Li-Iafrate approximation was used to determine an accurate exchange-correlation potential in the exchange-only limit. The results of two models, one where electron translation factors in the orbitals used to calculate the potential are ignored and another where partial electron translation factors are included, are compared with available experimental data as well as a selection of previous theoretical calculations.

Figure 1

Single-particle probabilities for each spin orbital to transfer between centers (thick lines) and to ionize (thin lines) in the pETF model for an impact energy of 40 keV/amu.

Figure 2

Total cross section for single ionization of the target. Theoretical results: pETF (solid line), nETF (dotted line), and CDW-EIS of Miraglia and Gravielle [27] (dashed line). Experimental data: Diamonds [14], circles [16], and squares [13].

Figure 3

Total cross section for single ionization of the projectile. Theoretical results: pETF (solid line), nETF (dotted line), and IEVM of Sigaud and Montenegro [23] (dashed line). Experimental data: Diamonds [14].

Figure 4

Total cross section for single capture to the projectile. Theoretical results: pETF (solid line), nETF (dotted line), and CDBW-4B (post form) of Ghanbari-Adivi and Ghavaminia [30] (dashed line). Experimental data: Diamonds [14] and circles [16].

Figure 5

Total cross section for double ionization of the target. Theoretical results: pETF (solid line) and nETF (dotted line). Experimental data: Diamonds [14], circles [16], and squares [13].

Figure 6

Total cross section for transfer ionization of the target. Theoretical results: pETF (solid line) and nETF (dotted line). Experimental data: Diamonds [14] and circles [16].

Figure 7

Total cross section for simultaneous single ionization of the target and the projectile. Theoretical results: pETF (solid line), nETF (dotted line), and IEVM of Sigaud and Montenegro [23] (dashed line). Experimental data: Diamonds [14] and crosses [17].

Figure 8

Total cross section for simultaneous double target and single projectile ionization. Theoretical results: pETF (solid line), nETF (dotted line), and IEVM of Sigaud and Montenegro [23] (dashed line). Experimental data: Diamonds [14] and crosses [17].