Electron impact excitation of S VIII from its ground state

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Abstract
The R-matrix method is used to calculate electron-impact collision strengths for transitions in S VIII from its ground state (2Po). Configuration interaction wavefunctions are used to represent the twelve target states which are included in the calculation. Finally, the effective collision strengths have been calculated for electron temperatures in the range 5*104-106 K by assuming a Maxwellian electron velocity distribution for the incident electrons. This is the first detailed calculation for this ion in which the effects of exchange, channel couplings and short-range correlation are properly taken into account.