x formed via dissociation of FLU 4+ into the (2,2) channel is calculated to be ∼ 4.6 × 10 -22 kg•m/s using the experimental KER value of FLU 2+ dissociation for the (1,1) channel (2.46 ± 0.04 eV) , which is in agreement with the observed momentum value of (4.43±0.02)×10 -22 kg•m/s (calculation is provided in the ESI). This value is obtained by fitting the momentum profile of C 7 H 2+