Laboratory angular distribution at mass-to-charge (m/z) of 78 (SiC₄H₂⁺) recorded in the reaction of the silylidyne radical with diacetylene together with selected time-of-flight (TOF) spectra. Open circles indicate experimental data, and the solid red line indicates the calculated distribution with the best-fit center-of-mass (CM) functions as depicted in Figure 4. CM designates the center-of-mass angle.