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Effective collision strengths for electron‐impact excitation of transitions within the ground 1 s 2 2 s 2 2 p 4 manifold of O‐like Fe 18+
Author(s) -
Santana Juan A.,
Ishikawa Yasuyuki
Publication year - 2009
Publication title -
international journal of quantum chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.484
H-Index - 105
eISSN - 1097-461X
pISSN - 0020-7608
DOI - 10.1002/qua.22023
Subject(s) - atomic physics , physics , electron , excitation , electron ionization , hamiltonian (control theory) , ground state , r matrix , chemistry , ion , ionization , quantum mechanics , mathematical optimization , mathematics
Collision strengths have been computed for the electron impact excitations of parity and spin forbidden transitions within the ground 1 s 2 2 s 2 2 p 4 manifold of Fe XIX (Fe 18+ ). The calculations were carried out using a relativistic R‐matrix close‐coupling method based on the effective many‐body Hamiltonian. Twenty‐six target states were included in the close‐coupling expansion. Effective collision strengths, assuming a Maxwellian electron velocity distribution, were evaluated for all transitions within the ground configuration. Good agreement is found with previous Breit‐Pauli R‐matrix calculations at low electron temperatures, 5.0 ≤ log T e ≤ 6.0 K, for all the transitions, whereas significant differences are found for electron temperatures in the range 6.0 ≤ log T e ≤ 7.0 K. © 2009 Wiley Periodicals, Inc. Int J Quantum Chem, 2009