High-resolution laser-induced fluorescence spectrum of the B4Σu−-X4Σg− transition of C2+

We have usedlaser-induced fluorescence on a fast ion beam to study the B4Σu−-X4Σg− system of the homonuclear molecular ion C2+. We have observed rotational lines of the (1,1) band by using a Doppler tuning technique and the high resolution obtained has permitted a detailed study of spin splitting. Molecular constants and interaction parameters were evaluated including revised results for the (1, 0) band.