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Title: Electron impact excitation of helium in Debye plasma

The probability, differential, and integral scattering cross sections of the 1{sup 1}S→2{sup 1}S and 1{sup 1}S→2{sup 1}P transitions of helium have been calculated in the first Born approximation. The projectile-target interactions depending on the temperature and the density of plasma are described by the Debye-Hückel model. Wave functions of the target before and after collision were modeled by non orthogonal Hartree-Fock orbitals. The wave functions parameters are calculated with the Ritz variational method. We improve our unscreened first Born approximation integral cross sections by using the BE-scaled (B stands for binding energy and E excitation energy) method. The second Born approximation has also been used to calculate the excitation cross sections in Debye plasma. Our calculations are compared to other theoretical and experimental results where applicable.
Authors:
; ; ; ;  [1] ;  [2] ;  [3]
  1. Département de Physique, Faculté des Sciences and Techniques, Université Cheikh Anta Diop, Dakar-Fann (Senegal)
  2. Institut International des Sciences et de Technologie, 28 Avenue des Ambassadeurs Dakar-Fann (Senegal)
  3. ARC Centre for Antimatter-Matter Studies, Curtin University, GPO Box U1987, Perth, Western Australia 6845 (Australia)
Publication Date:
OSTI Identifier:
22408265
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 3; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BINDING ENERGY; BORN APPROXIMATION; COLLISIONS; COMPARATIVE EVALUATIONS; DIFFERENTIAL CROSS SECTIONS; ELECTRONS; EXCITATION; EXPERIMENTAL DATA; HARTREE-FOCK METHOD; HELIUM; INTEGRAL CROSS SECTIONS; INTERACTIONS; PLASMA; PLASMA DENSITY; PROBABILITY; SCATTERING; VARIATIONAL METHODS; WAVE FUNCTIONS