Semiclassical treatment of excitation and electron loss inAq++H(1s)collisions using spherical Bessel functions

Abstract

We perform monocentric close-coupling calculations to obtain partial and total cross sections for excitation and electron loss in bare A q+ +H͑1s͒ collisions, with 1 ഛ q ഛ 6, for intermediate ͑E =40 keV/amu͒ to high ͑E = 7000 keV/ amu͒ impact energies. We use underlying basis sets of even-tempered Slater-type orbitals and confined spherical Bessel functions and compare the accuracy of the cross sections derived from these two implementations. Scaling rules are then established for the partial excitation cross sections of interest in fusion plasma research. We also undertake impact parameter first-Born calculations using the spherical Bessel underlying set to compare in the course of collision the close-coupling and perturbative descriptions of the ionization process.

Electron excitation of hydrogen atom by ions impact in the energy range 20–1000 keV/amu

“…Our results overestimate the results of Schultz et al [14] in the energy region 20 kev to 50 keV and then underestimates above the said energy region. In comparison to the theoretical results of Errea et al [20] and Shakeshaft [39], our results bear the same features. In the high energy region, BCCIS results are closer to those of Errea et al [20] and Schultz et al [14].…”

“…In comparison to the theoretical results of Errea et al [20] and Shakeshaft [39], our results bear the same features. In the high energy region, BCCIS results are closer to those of Errea et al [20] and Schultz et al [14]. For 2p excitations, our BCCIS results in Figure 1(b) are compared with the theoretical results of Schultz et al [14], Errea et al [20], Shakeshaft [39] and Tong et al [26].…”

“…In Figure 1(a) and 1(b) we display the 2s and 2p excitation cross sections as function of the impact energy by means of our BCCIS approximation along with other theoretical and experimental results. In Figure 1(a) our 2s excitation results are compared with the theoretical works of Schultz et al [14], Tong et al [26], Errea et al [20]. Our calculated 2s excitation cross sections are in good agreement with the lattice time-dependent results by Schultz et al [14] at both the low and high energy ends.…”

“…Schultz et al [14] calculated the excitation cross section in H + and H collisions in a wide range of collision energies by lattice (equal space mesh) time-dependent method and their results are in reasonable agreement with the available experiments. In order to complement previous works dedicated to capture and ionization, Harrel et al [15], Belkic et al [16], Toshima [17], Illescas and Riera [18], Hardie and Olson [19], Errea et al [20] provided total and partial excitation cross sections for A q+ (q=1-6) +H(1s) collisions in the energy range 40 to 7000 keV/amu. In the high energy region, eikonal impulse approximation (EIA) is used to calculate the excitation cross sections by Rodrigues and Miraglia [21].…”

Classical treatment of ion-H2O collisions with a three-center model potential

“…In this respect, it has to be noted that the lower bound of validity of perturbative calculations increases with the projectile charge [58], so particular care has to be taken before including perturbative cross sections in the Monte Carlo track structure codes that aim at describing the dynamics induced by charged particles passing through biological environments [15,16]. We safely venture that our nonperturbative CTMC results are more accurate than those of Refs.…”