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Low-energy electron collisions with C2 using the R-matrix method
Calculations are presented for the bound and continuum states of the C[?]2 system using the polyatomic version of the UK molecular R-matrix code. The calculations, based on a 26-state close-coupling expansion, show the presence of three bound doublet states of C[?]2 and a quartet state that only becomes bound at large internuclear separation. A number of resonance states are found and their behaviour as a function of the C2 bond length is studied. Cross sections for electron impact electronic excitation are presented with particular emphasis on excitation of the d 3Pg state which is responsible for the well-known Swan emission bands