Crossed-Beam Slice Imaging of Cl Reaction Dynamics with Butene Isomers

Baptiste Joalland (1) , Yuanyuan Shi (1) , Nitin Patel (1) , Richard van Camp (1) , Alexander M. Mebel (2) , Arthur G. Suits (1)

1 Wayne State University [Detroit]
2 FIU - Florida International University [Miami]

We present a crossed-beam imaging study of 
the reaction of chlorine atoms with several butene isomers. A 
high-intensity pulsed ablation Cl source is used with DC slice
 imaging and single-photon ionization detection at 157 nm to 
record the velocity-flux contour maps for these reactions. The 
target unsaturated hydrocarbons are 1-butene, trans-2-butene,
 cis-2-butene, and isobutene (2-methylpropene). Data are
 obtained at collision energies of ∼13.0 kcal.mol−1. Distinct
 differences in the scattering distributions and in particular the
 coupling of angular and translational energy release provide
 insight into the dynamics of this little-studied class of 
reactions. We find that these distributions reflect the energetics 
for competition between addition/elimination and direct abstraction in line with ab initio thermochemical data. A possible role for Cl atom roaming mediating the addition/elimination pathway is suggested.

Domaines: Physique [physics]; Chimie

Baptiste Joalland, Yuanyuan Shi, Nitin Patel, Richard van Camp, Alexander M. Mebel, et al.. Crossed-Beam Slice Imaging of Cl Reaction Dynamics with Butene Isomers. Dynamics of Molecular Collisions, Jul 2013, Granlibakken, CA, United States. ⟨hal-01246986⟩