Ultrafast dynamics of cationic electronic states of vinyl bromide by strong-field ionization-photofragmentation

Abstract

Abstract Strong field ionization-photofragmentation (SFI-PF) with ultrafast pump–probe scheme is a powerful approach to study the dynamics of molecular cationic electronic states. Here we carry out a SFI-PF study on the cationic electronic states of vinyl bromide, C2H3Br. The yields of the parent C2H3Br+ and the formation of the fragment (Br+, C2H2 + and C2H3 +) ions have been measured at different pump–probe delay time. Analysis provides experimental evidence of A 2 A ′ –X2A″ internal conversion of vinyl bromide cations which occurs in a time of about 220 fs, and the time of C2H3 + formation induced by the dissociation of the A 2 A ′ state around 300 fs. The study would add our knowledge of the behavior of electronic excited states of complex molecular cations.