Article Dans Une Revue The Journal of Chemical Physics Année : 2018

Coulomb explosion imaging of CH 3 I and CH 2 ClI photodissociation dynamics

Felix Allum
  • Fonction : Auteur
Michael Burt
  • Fonction : Auteur
Per Johnsson
Jan Lahl
Jason Lee
  • Fonction : Auteur
Robert Mason
  • Fonction : Auteur
Dimitrios Rompotis
  • Fonction : Auteur
Arnaud Rouzée
  • Fonction : Auteur
  • PersonId : 1402265
  • IdRef : 119589222
Henrik Stapelfeldt
  • Fonction : Auteur
Farzaneh Ziaee
  • Fonction : Auteur

Résumé

The photodissociation dynamics of CH3I and CH2ClI at 272 nm were investigated by time-resolved Coulomb explosion imaging, with an intense non-resonant 815 nm probe pulse. Fragment ion momenta over a wide m/z range were recorded simultaneously by coupling a velocity map imaging spectrometer with a pixel imaging mass spectrometry camera. For both molecules, delay-dependent pump-probe features were assigned to ultraviolet-induced carbon-iodine bond cleavage followed by Coulomb explosion. Multi-mass imaging also allowed the sequential cleavage of both carbon-halogen bonds in CH2ClI to be investigated. Furthermore, delay-dependent relative fragment momenta of a pair of ions were directly determined using recoil-frame covariance analysis. These results are complementary to conventional velocity map imaging experiments and demonstrate the application of time-resolved Coulomb explosion imaging to photoinduced real-time molecular motion.

Dates et versions

hal-02323002 , version 1 (21-10-2019)

Identifiants

Citer

Felix Allum, Michael Burt, Kasra Amini, Rebecca Boll, Hansjochen Köckert, et al.. Coulomb explosion imaging of CH 3 I and CH 2 ClI photodissociation dynamics. The Journal of Chemical Physics, 2018, 149 (20), pp.204313. ⟨10.1063/1.5041381⟩. ⟨hal-02323002⟩
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