Differential cross sections for positron impact excitation of hydrogen

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

“…2 p cross section for various screening strengths and for different incident positron energies. This table also includes the results, for the unscreened case, obtained by using some other methods, such as closecoupled pseudostate approximation, 46 coupled-channel optical model, 47 twelve-state close coupling approximation, 48 eigen model, 49 two-center convergent close-coupling approach, 51 33-state approximation, 53 distorted wave polarized orbital (DWPO) model, 55 and unitarised Eikonal-Born series version 1 (UEBS1). 57 From this table, we see that our present results are in close agreement with some of the most accurate results available in the literature.…”

Ionization cross sections in collisions between two hydrogen atoms by a quasi-classical trajectory Monte Carlo model

“…Our idea is based on the fact that in the classical model it is simple to turn on and off the Coulomb potentials between coliders. 43 In this scenario, it is easy to test the result of a particular interaction between particles. By neglecting the corresponding interactions the full four-body system can reduce to a 3-body system.…”

2s–3s excitation for positron–metastable hydrogen collisions

“…The scattering of positron from atomic hydrogen provides an attractive testing ground for scattering theories, since the positron-hydrogen system is the simplest three-body system. Excitation from the ground state hydrogen to higher states by positron impact has been extensively studied by various approaches [1][2][3][4][5][6][7], whereas only limited theoretical methods have focused on the investigation of the interaction of positron with the excited state hydrogen. Earlier distorted-wave calculations based on a two-potential approach have been performed by Jha et al [8] and Deb et al [9].…”