Differential analysis of the ionization of hydrogen in Debye plasmas by light particle impact

E. ACEBAL; S. H. MARTÍNEZ; A. CUENCA; S. OTRANTO

Viena

Conferencia; 21st Meeting on Atomic Processes in Plasmas; 2023

International Atomic Energy Agency

In the present work, we calculate and analyze ionization total, singly dierential andfully dierential cross sections for hydrogen embedded in a weak plasma environmentdue to light particle impact. Calculations at the total and singly dierential level, eitherin terms of the electron emission energy or the emission angle, are performed within theframework of the classical trajectory Monte Carlo method [1]. Fully dierential crosssections (FDCS), on the other hand, are calculated by means of a Born-3DW model, inwhich distorted waves are used to represent the interactions among the three fragmentsresulting from the collision (projectile, target ion and emitted electron) [2,3]. This modelcan be considered the natural extension of the extensively used Born-3C model [4,5] forthe case of screened interactions. In all cases, the interactions among particles weredescribed by means of the Debye-Hückel potential.The main focus of our study is placed on describing the sensitivity of the structuresof the dierent cross sections with the degree of screening and tracing the physicalorigin of the changes they exhibit. While total cross sections are directly analyzedin terms of the projectile charge sign and the Debye screening length (r D ) at a givenimpact energy, dierential cross sections require the specication of the geometricalconguration resulting from the collision process. In addition, we show that a scalinglaw for the fully dierential cross section in terms of the nuclear charge Z, proposed byKornberg and Miraglia in the photo-double ionization context [6], also holds for the lightparticle impact ionization of hydrogenic ions in the present screened context.References1. R. E. Olson, A. Salop, Phys. Rev. A 16, 531 (1977).2. E. Acebal, A. Cuenca, S. Martı́nez, S. Otranto, Phys. Plasmas 28, 123510 (2021).3. E. Acebal, S. Martı́nez, S. Otranto, Atoms 11, 15 (2023).4. C. R. Garibotti, J. E. Miraglia, Phys. Rev. A 21, 572 (1980).5. M. Brauner, J. S. Briggs, H. Klar, J. Phys. B 22, 2265 (1989).6. M. A. Kornberg, J. E. Miraglia, Phys. Rev. A 49, 5120 (1994).