Photodissociation of propargyl bromide and photoionization of the propargyl radical

Velocity map imaging was used to study the 193 nm photodissociation of propargyl bromide C3H3Br as well as the photoionization dynamics of the resulting propargyl radical C3H3. Images were recorded by using single-photon vacuum ultraviolet ionization of the propargyl radical and by using two-photon resonant, three-photon ionization of the ground state Br(P-2(3/2)) and spin-orbit excited Br-*(P-2(1/2)) atoms. Analysis of these data allowed the determination of the branching ratio Br:Br-* as well as the photofragment angular distributions. Images of C3H3 produced by the photodissociation of both C3H3Br and C3H3Cl were recorded at several energies between 8.97 and 9.12 eV, as well as at 9.86 eV, and showed no obvious internal energy dependence of the relative photoionization cross sections. (c) 2006 American Institute of Physics.