Fully differential cross section for O8+-impact ionization of Li

Abstract

We present various differential cross sections for the single ionization of Li by O 8+ ions. We use a time-dependent close-coupling approach to model the evolution of a one-active-electron wavefunction in the field of the incoming projectile for a range of impact parameters. In addition a Fourier transform approach is used to extract differential cross sections for a specific projectile momentum transfer value. This scheme allows us to incorporate information about the interaction of the two heavy nuclei (the so-called NN interaction) and to assess its influence in the differential cross sections. We find noticeable differences in the shape of the differential cross sections when we include (neglect) the NN interaction. Our single differential cross section calculation shows excellent agreement with experimental data. In addition recent measured double differential cross sections as a function of electron energy and transverse momentum transfer are reasonably well reproduced by our theoretical calculations.

Doubly differential cross sections for ionization of lithium atom by protons and O8+ ions

“…[7,8] are not on the absolute scale, we have normalized them to our nonpertubative results for 2-eV ejection from Li(2s) at transverse momentum transfer η = 0.65 a.u. This normalization procedure was also used in the previous studies [8,15,16,9]. dε dη for the electron ejection energies of 2, 10, and 20 eV in the p-Li(2s) and p-Li(2p) collisions at 6 MeV, respectively.…”

“…where Z eff = 1. The same approximation for the NN interaction has been used in the TDCC calculation [15].…”

“…In the differential cross sections of Ref. [15], an extra factor is missed [29], which leads to the normalization issue. Hence, we normalized the DDCS of Ref.…”

Differential cross sections for single ionization of Li in collisions with fast protons andO8+ions

“…• experimental data from [13] as renormalized recently [32]. [15] and [14], (results from [14] are normalised to the present data at η=0.65 a.u. ).…”

“…The experimental data of [13] and [12] are not on the absolute scale, only the relative normalisation was fixed for different E e and for Li(2p) relative to Li(2s). Following previous works [13][14][15] we have fixed the absolute scale in the Figures by normalising the data to our CDW-EIS cross sections for 2eV ejection from Li(2s) at η=0.65 a.u.…”