Reactive formation of dicarbon from the reactions of electronically excited radicals, CH(A2Δ) and CCl(A2Δ)

Dispersed emission spectra resulting from the 2 × 193 nm photodissociation of CCl4 at a resolution of 1 nm. The data shown are an average of several spectra and were corrected by subtracting an averaged background signal that was obtained in the absence of CCl4. The peak at 246 nm is the 2s22p3s(1P1) → 2s22p2(1S0) (n = 3 → n = 2) transition of C(I). The lines at 495 nm and 744 nm are experimental artifacts due to the second and third order diffractions of the 246 nm line.