Figure 1

Figure 1: Electronic behavior predetermines molecular dynamics in the molecule ethylene (C2H4). (a) When a laser pulse removes one electron from the HOMO (yellow) and another electron from the HOMO-2 (pink), the molecule has a greater tendency to fragment into two CH2+ ions. (b) When a laser pulse removes electrons from the HOMO (yellow) and HOMO-1 (blue), the ethylene has a high probability of breaking into an H+ ion and a C2H3+ ion.