Reaction Dynamics of Carbon‐Centered Radicals in Extreme Environments Studied by the Crossed Molecular Beam Technique

Untangling the chemical evolution of Titan's atmosphere and surface–from homogeneous to heterogeneous chemistry

“…These collision complexes isomerized yielding ultimately the linear diacetylene molecule (s3) which decomposed without exit barrier to the linear 1,3-butadiynyl radical plus atomic hydrogen. 110 Since the diacetylene molecule belongs to the D ∞h point group, the hydrogen atom could be emitted with equal probability from either carbon atom of the rotationally excited diacetylene molecule. Since diacetylene can only be excited to B-like rotations, this results in a forward-backward symmetric center-of-mass angular distribution at all collision energies.…”

Are Nonadiabatic Reaction Dynamics the Key to Novel Organosilicon Molecules? The Silicon (Si(3P))–Dimethylacetylene (C4H6(X1A1g)) System as a Case Study

“…Whereas the kinetics − and chemical dynamics − of reactions of ground-state carbon atoms with unsaturated hydrocarbons have been thoroughly explored, a systematic investigation of isovalent organosilicon systems and the potential role of intersystem crossing is missing from the emerging dialogue surrounding silicon-hydrocarbon reactivity. − ,− Interestingly, kinetic studies by Basu and Husain , and Canosa et al suggest that ground-state silicon, Si­( 3 P j ), should react fast, close to gas kinetics values, with unsaturated hydrocarbons revealing rate constants of a few 10 –10 cm 3 s –1 . However, these studies probed solely the decay kinetics of the silicon atom, and reaction products could not be assigned.…”