Coulomb explosion imaging of concurrent CH₂BrI photodissociation dynamics

Michael Burt , Rebecca Boll , Jason W. L. Lee , Kasra Amini , Hansjochen K\"ockert , Claire Vallance , Alexander S. Gentleman , Stuart R. Mackenzie

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Sadia Bari C\'edric Bomme Stefan D\"usterer Benjamin Erk Bastian Manschwetus Erland M\"uller Dimitrios Rompotis Evgeny Savelyev Nora Schirmel Simone Techert Rolf Treusch Jochen K\"upper Sebastian Trippel Joss Wiese Henrik Stapelfeldt Barbara Cunha de Miranda Renaud Guillemin Iyas Ismail Lo\"ic Journel Tatiana Marchenko J\'er\^ome Palaudoux Francis Penent Maria Novella Piancastelli Marc Simon Oksana Travnikova Felix Brausse Gildas Goldsztejn Arnaud Rouz\'ee Marie G\'el\'eoc Romain Geneaux Thierry Ruchon Jonathan Underwood David M. P. Holland Andrey S. Mereshchenko Pavel K. Olshin Per Johnsson Sylvain Maclot Jan Lahl Artem Rudenko Farzaneh Ziaee Mark Brouard Daniel Rolles

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classification ⚛️ physics.chem-ph

keywords coulombdynamicsexplosionimagingphotodissociationabsorptionavailablebond

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The dynamics following laser-induced molecular photodissociation of gas-phase CH$_{2}$BrI at 271.6 nm were investigated by time-resolved Coulomb explosion imaging using intense near-IR femtosecond laser pulses. The observed delay-dependent photofragment momenta reveal that CH$_{2}$BrI undergoes C-I cleavage, depositing 65.6% of the available energy into internal product states, and that absorption of a second UV photon breaks the C-Br bond of CH$_{2}$Br. Simulations confirm that this mechanism is consistent with previous data recorded at 248 nm, demonstrating the sensitivity of Coulomb explosion imaging as a real-time probe of chemical dynamics.

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Coulomb explosion imaging of concurrent CH₂BrI photodissociation dynamics

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