(a) TOF spectra recorded at selected laboratory angles (9﹩\mathop{.}\limits^{^\circ }﹩25–34﹩\mathop{.}\limits^{^\circ }﹩25) for the H₂ loss channel (m/z = 50) in the 193 nm photodissociation of vinylacetylene (C₄H₄). Open circles represent the experimental data. The green lines correspond to the best-fit forward-convolution simulations, while the blue and red lines indicate the individual contributions from true H₂ loss and dissociative ionization of the H loss channel (m/z = 51), respectively. (b) Center-of-mass translational energy distributions, P(E_T), for the H₂ loss channel (blue) and the H loss contribution (red) derived from the best-fit simulations. The shaded regions represent the uncertainties in the fits.