Formation of 2s-State Hydrogen Atom in Proton-Lithium Inelastic Scattering

Elaborate coupled static formalism is employed for treatment of proton-lithium collisions at wide range of incident energies between 10 and 1000？Kev. Coupled static and frozen core approximations are employed for calculating partial and total cross sections. Only elastic and formation of excited hydrogen, H(2s), channels are considered. Total cross sections are calculated using seven partial waves Green’s function expansion technique of total angular momentum . Proposed iterative approach allows for reliable representation of the core potentials using elaborate variational calculation of target orbitals. Polarization potential of lithium atom is taken into consideration in calculating corresponding total cross sections. Quite interesting reliable results were obtained in comparison with other theoretical approaches. 1. Introduction There has been a growing interest in the investigation of electron capture from alkali-metal atom. As an example, charge-transfer process with Li has been suggested to occur in plasma diagnostic probes [1]. Besides, alkali-metal atoms are many-electron systems that can be simplified to be one-electron systems due to a single valence electron. Theoretical calculations as well as experimental measurements have been carried out for ionization of and electron capture from alkali-metal atoms by proton impact [1, 2]. Investigation of elastic scattering of positrons from noble gases using an iterative Green’s function partial wave expansion formalism and a model static and polarization potentials are derived for describing the interactions of positrons with closed shell atoms [3, 4]. The formation of excited hydrogen atom ( ) in the process has been studied only in low energy ranges. The electron capture cross sections from Li by high energy (for heavy particle collision on atoms, the ratio of the projectile velocity to the orbital electron velocity is much larger than 1) incident protons in energy range between 200 and 10000？Kev have been investigated by using the continuum distorted wave (CDW) approximation [5]. The formation of excited hydrogen atom ( ) in Oppenheimer Brinkman and Kramer (OBK) approximation is investigated [6]. The differential and total cross sections have been investigated in the formation of H-atom in the 2s-excited state of proton-lithium scattering by using the Coulomb projectile Born (CPB) approximation in the energy range from 50 to 10000？Kev [7]. Proton-alkali atom (Na, K, Rb, and Cs) collision has also studied in the wave formulation of impulse approximation in the energies ranging from 50 to 500？Kev