Time-Dependent UV-Induced Dynamics in 2-Bromothiophene*

We will present an experimental study in the time-resolved ultrafast nuclear dynamics in 2-Bromothiophene (2-C₄H₃BrS), observed with UV (240nm) pump-IR (800nm) probe spectroscopy and coincident Coulomb explosion imaging using a Cold Target Recoil Ion Momentum Spectrometer (COLTRIMS). We have identified two- and three- body molecular fragmentation channels that show a variety of dynamics ranging from direct bromine dissociation to ring fragmentation. Additionally, further analysis was done of the momentum vectors of the ion fragments to show unique fragmentation pathways the molecule can undergo to achieve the same final ion products – including the potential for ring-opening prior to fragmentation. We will conclude the presentation by proposing further studies that can be done using different UV photon energies to excite the molecule and comparisons with the conformer 3-Bromothiophene.