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

Formation of Rydberg atoms due to 1 s → nlm excitations of hydrogen by positron impact, for arbitrary n, l, m, in dense quantum plasma has been investigated using a distorted wave theory which includes screened dipole polarization potential. The interactions among the charged particles in the plasma have been represented by exponential cosine-screened Coulomb potentials. Making use of a simple variationally determined hydrogen wave function, it has been possible to obtain the distorted wave scattering amplitude in a closed analytical form. A detailed study has been made to explore the structure of differential and total cross sections in the energy range 20–300 eV of incident positron. For the unscreened case, our results agree nicely with some of the most accurate results available in the literature. To the best of our knowledge, such a study on the differential and total cross sections for 1 s → nlm inelastic positron-hydrogen collisions in dense quantum plasma is the first reported in the literature.
Authors:
 [1] ;  [1] ;  [2]
  1. Department of Mathematics, Burdwan University, Golapbag, Burdwan 713 104, West Bengal (India)
  2. (India)
Publication Date:
OSTI Identifier:
22403299
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 21; Journal Issue: 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ATOMS; DISTORTED WAVE THEORY; EXCITATION; HYDROGEN; POSITRONS; QUANTUM PLASMA; SCATTERING AMPLITUDES; TOTAL CROSS SECTIONS