Collision strengths for electron impact excitation of Cl IX from its ground state

Abstract

The R-matrix method is used to calculate collision strengths for electron impact excitation of Cl IX from its ground state (2P0). Configuration interaction wavefunctions are used to represent twelve target states which are included in the calculations. Finally the effective collision strengths have been calculated for electron temperatures in the range (5*103-105) by assuming a Maxwellian electron velocity distribution for the incident electrons. This is the first detailed calculation on this ion in which the effects of exchange, channel couplings and short-range correlation effects are taken into account.