Atomic Processes in Plasmas

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

Not scheduled

20m

Board Room A (Vienna International Centre)

Poster Session

Speaker

Sebastian Otranto (Instituto de Física del Sur (IFISUR))

Description

In the present work, we calculate and
analyze ionization total, singly differential and
fully differential cross sections for hydrogen
embedded in a weak plasma environment due to
light particle impact. Calculations at the total and
singly differential level, either in terms of the
electron emission energy or the emission angle,
are performed within the framework of the
classical trajectory Monte Carlo method [1]. Fully
differential cross sections (FDCS), on the other
hand, are calculated by means of a Born-3DW
model, in which distorted waves are used to
represent the interactions among the three
fragments resulting from the collision (projectile,
target ion and emitted electron) [2,3]. This model
can be considered the natural extension of the
extensively used Born-3C model [4,5] for the case
of screened interactions. In all cases, the
interactions among particles were described by
means of the Debye-Hückel potential.
The main focus of our study is placed on
describing the sensitivity of the structures of the
different cross sections with the degree of
screening and tracing the physical origin of the
changes they exhibit. While total cross sections
are directly analyzed in terms of the projectile
charge sign and the Debye screening length ($r_D$) at
a given impact energy, differential cross sections
require the specification of the geometrical
configuration resulting from the collision process.
In addition, we show that a scaling law for
the fully differential cross section in terms of the
nuclear charge Z, proposed by Kornberg and
Miraglia in the photo-double ionization context
[6], also holds for the light particle impact
ionization of hydrogenic ions in the present
screened context.

References

[1] Olson, R.E.; Salop, A. Phys. Rev. A 16, 531 (1977).
[2] Acebal, E.; Cuenca, A.; Martínez, S.; Otranto, S. Phys.
Plasmas 28, 123510 (2021).
[3] Acebal, E.; Martínez, S.; Otranto, S. Atoms 11, 15
(2023).
[4] Garibotti, C.R.; Miraglia, J.E. Phys. Rev. A 21, 572
(1980).
[5] Brauner, M.; Briggs, J.S.; Klar, H. J. Phys. B 22, 2265
(1989).
[6] Kornberg, M.A.; Miraglia, J.E. Phys. Rev. A 49, 5120
(1994).