Theoretical investigation of the elastic scattering of ${{\rm{e}}}^{\pm }$ by the ions of nitrogen isonuclear series

Abstract

This work reports on differential, integrated and momentum transfer cross sections for the elastic scattering of electrons and positrons off the ions of nitrogen isonuclear series (N+ - N7+) over the energy range 1–500 eV. Calculations of these observable quantities involve the solution of Dirac relativistic wave equation employing a pure Coulomb potential and a short range potential. The latter comprises static, exchange, polarization and absorption potentials. Effects of these individual potentials on angular distribution of elastically scattered electrons are investigated throughout this ionic series. Differential cross sections for electron and positron scattering are compared with each other to demonstrate the difference of their collision dynamics. A satisfactory agreement between our predictions and other available data, experimental and theoretical, is observed.

Theoretical studies on the elastic scattering of e± off the ions of xenon isonuclear series

“…This coherent interference, a reflection of core penetration of projectile electron, is manifested as sharp structure in the angular distribution. This Airy structure does not have noteworthy appearance in DCS of electrons scattered elastically from the ions of isonuclear series of low or intermediate atomic number [3,12,19]. Prominent short-range interaction, emerging due to the large number of dressing electrons of xenon ions of low and intermediate ionicities, contribute to this Airy structure.…”

“…This Airy structure is a feature of elastic collisions from the target of high atomic number that can serve as a provider of strong short-range potential. This feature is not eyecatching for the targets of low and intermediate atomic number [3,12,19]. The airy structure declines slowly with the increase of ionicity through the decrease of number and magnitude of the interference extrema.…”

“…Moreover this theory carries enormous importance for the spectroscopic clarifications and theoretical modeling of the formation and time evolution of artificial, terrestrial, space and astrophysical plasmas [1]. Data of electron-ion collisions are required in such applied and research areas as atmospheric physics, radiation dosimetry, nuclear medicine, radiation biology, radiotherapy, fusion energy research, semiconductor lithography, x-ray lasers, etc [2][3][4]. On the other side, interpreting the scattering of positron by positive ions opens the door to the new physics and applications complementary to the dynamics of electron-ion collisions.…”

“…This study is also motivated to glean information on the charge (ionic) and energy dependence of the of various scattering observables. Previously we studied the features of isonuclear series of light and medium atoms, like nitrogen [3], neon [12] and argon [2]. Therefore it is an additional impetus to investigate how the above features across an isonuclear series emerges out for a heavy atom and to see whether a new physics content unfolds.…”

Elastic electron scattering from Ar@C60 z+: Dirac partial-wave analysis

“…The target ions considered in those experiments were primarily rare gases that had multiple ionicity with low-energy electron projectiles. On the theoretical side, the Dirac partial-wave approach for elastic electron scattering from Ar z+ (z = 1-18) [14] and N z+ (z = 1-7) [15] was recently reported.…”