The multichannel CH + CH reaction was studied, at room temperature, in a low-pressure fast-flow reactor. CH was obtained from the reaction of CHBr3 with potassium atoms. An intense chemiluminescence from C2H(A2Π) and a much weaker one from C2(d3Πg) were observed. The C2H(A2Π) emission spectrum appeared as a continuum extending from 380 nm to the limit of our detection range at 800 nm. C2(d3Πg) was specifically produced in the v = 2 level, and the relative ratio C2(d3Πg)/C2H(A2Π) was proportional to the total pressure, this behavior being attributed to a production of C2 by induced collision crossing states from excited vinylidene to the surface leading to C2(d3Πg) + H2. Relative product branching ratios were determined over the channels yielding the following atoms:  H + C2H, >90%; C + CH2, <10%.