Coulomb implosion of tetrabromothiophene observed under multiphoton ionization by free-electron-laser soft-x-ray pulses - Archive ouverte HAL
Article Dans Une Revue Physical Review A : Atomic, molecular, and optical physics [1990-2015] Année : 2019

Coulomb implosion of tetrabromothiophene observed under multiphoton ionization by free-electron-laser soft-x-ray pulses

Résumé

Soft-x-ray free-electron-laser pulses were used to create highly charged molecular tetrabromothiophene species by sequential multiphoton ionization from bromine 3 dorbitals. The experiment was performed at the SACLA facility in Japan and the products of molecular dissociation were analyzed by means of multicoincidence momentum-resolved ion time-of-flight spectroscopy. Total charge states up to +13 atomic units were produced, creating a particular dissociation pattern for the carbon ions, a Coulomb implosion, due to the concerted forces by the surrounding heavy bromine ions. This behavior was explored both experimentally and by numerical molecular-dynamics simulations and the fingerprints of the Coulomb implosion were identified in both. In simulations, Coulomb implosion was predicted to be highly sensitive to the initial (thermal) motion of the atoms and, after including vibrational motion for several temperatures, good general agreement between the experiment and simulations was found. The agreement with the experiment was further improved by adding charge dynamics to the simulation, according to our point-charge dynamics model with empirical rate constants.

Dates et versions

hal-02060821 , version 1 (07-03-2019)

Identifiants

Citer

E. Kukk, H. Myllynen, K. Nagaya, S. Wada, J. Bozek, et al.. Coulomb implosion of tetrabromothiophene observed under multiphoton ionization by free-electron-laser soft-x-ray pulses. Physical Review A : Atomic, molecular, and optical physics [1990-2015], 2019, 99 (2), ⟨10.1103/PhysRevA.99.023411⟩. ⟨hal-02060821⟩
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