Positron scattering from hydrogen atom embedded in weakly coupled plasma

Abstract

The positron-hydrogen collision problem in weakly coupled plasma environment has been investigated by applying a formulation of the three-body collision problem in the form of coupled multi-channel two-body Lippmann-Schwinger equations. The interactions among the charged particles in the plasma have been represented by Debye-Huckel potentials. A simple variational hydrogenic wave function has been employed to calculate the partial-wave scattering amplitude. Plasma screening effects on various possible mode of fragmentation of the system e þ þ Hð1sÞ during the collision, such as 1s ! 1s and 2s ! 2s elastic collisions, 1s ! 2s excitation, positronium formation, elastic proton-positronium collisions, have been reported. Furthermore, a detailed study has been made on differential and total cross sections of the above processes in the energy range 13.6-350 eV of the incident positron. V C 2013 American Institute of Physics.

Positron scattering from hydrogen atom embedded in dense quantum plasma

“…In this table, we have also included the corresponding results for weakly coupled plasma. We would like to state here that the rows and columns of Table V in our previous paper 27 were inadvertently interchanged. Also in Figure 8, we present the Ps formation cross sections as a function of the screening parameter l for both plasmas.…”

“…Of late, the authors have investigated the effects of screening of weakly coupled plasmas on the scattering of positrons from the hydrogen atoms. 27 The interactions among the charged particles in weakly coupled plasmas have been taken care of by Debye-Huckel potentials or screened Coulomb potentials (SSCP) 28 VðrÞ ¼ ð1=rÞe Àlr ðin a:u:Þ; (1) where l is the screening parameter. In the Debye model of screening, the screening parameter l is related to the Debye length k D by means of the relation k D ¼ 1=l…”

Positron impact excitations of hydrogen atom embedded in dense quantum plasmas: Formation of Rydberg atoms

“…Atomic excitation and ionization processes play an essential role in the interpretation of various phenomena associated with astrophysics, hot plasma physics, and experiments performed with charged ions. Of particular importance is the collision phenomena involving positrons, [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] because positron collisions have several important applications in diverse fields of astrophysics [24][25][26][27][28][29][30][31] and plasma physics. [32][33][34] Recently, the authors have investigated the effects of screening of weakly coupled plasma on the formation of Rydberg atoms due to the positron impact excitations of hydrogen atom.…”

Scattering of Electrons/positrons by H-atoms and H$_2$ Molecules under Weakly Coupled Plasmas

“…Atomic-molecular scattering of electrons or positrons in plasma environments has been investigated by several authors e.g. [7][8][9].…”