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Article Dans Une Revue Nature Communications Année : 2014

Tabletop imaging of structural evolutions in chemical reactions demonstrated for the acetylene cation

Résumé

The introduction of femto-chemistry has made it a primary goal to follow the nuclear and electronic evolution of a molecule in time and space as it undergoes a chemical reaction. Using Coulomb Explosion Imaging, we have shot the first high-resolution molecular movie of a to and fro isomerization process in the acetylene cation. So far, this kind of phenomenon could only be observed using vacuum ultraviolet light from a free-electron laser. Here we show that 266 nm ultrashort laser pulses are capable of initiating rich dynamics through multiphoton ionization. With our generally applicable tabletop approach that can be used for other small organic molecules, we have investigated two basic chemical reactions simultaneously: proton migration and C=C bond breaking, triggered by multiphoton ionization. The experimental results are in excellent agreement with the timescales and relaxation pathways predicted by new and quantitative $ab\ initio$ trajectory simulations.

Dates et versions

hal-01754835 , version 1 (30-03-2018)

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Heide Ibrahim, Benji Wales, Samuel Beaulieu, Bruno Schmidt, Nicolas Thiré, et al.. Tabletop imaging of structural evolutions in chemical reactions demonstrated for the acetylene cation. Nature Communications, 2014, 5, pp.4422. ⟨10.1038/ncomms5422⟩. ⟨hal-01754835⟩

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