In our experiment, we recorded a total of 33 fragmentation channels where the slope of the coincidence island is close to -1. Out of these, 28 channels show emission of one or more neutral particles (H/H 2 /C 2 H 2 ) prior to the CE into two singly charged fragments. Of these fragmentation channels, table I lists the channels populated without any loss of neutrals and II lists the channels populated after the loss of one or more neutrals as H/H 2 . Furthermore, we observed a coincidence island associated with a dication having a naked carbon skeleton formed after the emission of all 6-hydrogen atoms from parent butadiene dication. This is inferred from the presence of a coincidence island containing C + with C + 3 in figure .