Electron-impact excitation of the levels of carbon

Abstract

The R-matrix method is used to investigate electron-impact excitation of neutral carbon over an energy range of interest for fusion plasma modelling. Two independent calculations are carried out. In the first, all levels of carbon with are included in the expansion of the total wavefunction and cross sections including exchange are calculated for collision energies from threshold to 150 eV. In the second, all levels with are included in the expansion and spin-allowed cross sections excluding exchange are calculated from threshold to 60 eV. Cross sections and effective collision strengths are presented for important transitions.